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anonymous

  • 4 years ago

2-5m=13 steps again...

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  1. Mertsj
    • 4 years ago
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    Subtract 2 from both sides first.

  2. Mertsj
    • 4 years ago
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    What did you get?

  3. anonymous
    • 4 years ago
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    11

  4. Mertsj
    • 4 years ago
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    Now divide both sides by -5

  5. Mertsj
    • 4 years ago
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    What did you get?

  6. anonymous
    • 4 years ago
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    but that comes out to 2.2... and it needs to come out as a whole number..

  7. Mertsj
    • 4 years ago
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    That would be - 2.2 and it cannot come out as a whole number unless you copied the problem wrong.

  8. anonymous
    • 4 years ago
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    okay.. the real question is.. 13=5m-2 i didnt think it would natter if you flopped it around..

  9. Mertsj
    • 4 years ago
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    You didn't "flop it around". You changed 5m-2 to its opposite. That's like saying, ok, I'll just change this 10 to -10

  10. anonymous
    • 4 years ago
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    it still comes out 2.2...

  11. Mertsj
    • 4 years ago
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    Add 2 to both sides.

  12. Mertsj
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    \[13+2=5m-2+2\]

  13. Mertsj
    • 4 years ago
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    \[15=5m\]

  14. Mertsj
    • 4 years ago
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    Divide both sides by 5

  15. anonymous
    • 4 years ago
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    and the answers 3?

  16. Mertsj
    • 4 years ago
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    \[\frac{15}{5}=\frac{5m}{5}\]

  17. Mertsj
    • 4 years ago
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    yep

  18. anonymous
    • 4 years ago
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    okay tell me if i get this right to this next question.. -15=2t-11

  19. anonymous
    • 4 years ago
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    so would you add 15 to both sides?

  20. Mertsj
    • 4 years ago
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    ok

  21. Mertsj
    • 4 years ago
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    Remember you are trying to get the variable by itself. The variable has been multiplied by 2 and then had 11 subtracted from it. How would you "undo" those things so that the variable can be by itself?

  22. anonymous
    • 4 years ago
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    so.. then would you do -2t then? so then you could get rid of it?

  23. Mertsj
    • 4 years ago
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    You "undo" the stuff in reverse order. The variable was multiplied by 2 and 11 was subtracted. To undo that add 11 and then divide by 2

  24. anonymous
    • 4 years ago
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    oh.. i see that now. sorry.. this is really frustrating..

  25. Mertsj
    • 4 years ago
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    Well I know it is but if you keep at it, all of a sudden the light will come on.

  26. anonymous
    • 4 years ago
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    yeah, after i figure out what to either use to "undo" then i got the rest of the problem.. its just i never know what number to either subtract from or add.. you know what i mean?

  27. Mertsj
    • 4 years ago
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    I do know what you mean. Just always focus on getting the variable by itself by "undoing" the stuff. What did you get for this problem?

  28. anonymous
    • 4 years ago
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    i got, t=-2

  29. Mertsj
    • 4 years ago
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    that was very good. Do you have another one?

  30. anonymous
    • 4 years ago
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    yes i do, 7k-5=-19

  31. Mertsj
    • 4 years ago
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    Ok. What do you think comes first?

  32. anonymous
    • 4 years ago
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    and this is the part i mean i have troubles with.. like i never know if you would add -5bor -19..

  33. Mertsj
    • 4 years ago
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    What is the variable?

  34. Mertsj
    • 4 years ago
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    I don't mean the solution. I just want you to identify the variable. Is it x or y or ...what is it?

  35. anonymous
    • 4 years ago
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    the variable is k

  36. Mertsj
    • 4 years ago
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    Yes. Good. Now look at it. Is it multiplied or divided by something?

  37. anonymous
    • 4 years ago
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    7

  38. Mertsj
    • 4 years ago
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    Exactly. So at some point we're going to have to reverse that by dividing by 7.

  39. Mertsj
    • 4 years ago
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    But first, was anything added or subtracted to or from the k?

  40. anonymous
    • 4 years ago
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    yeah because the problem is 7k-5

  41. Mertsj
    • 4 years ago
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    Yes you are correct but I want you to tell me specifically what the number is and whether it was added or subtracted.

  42. Mertsj
    • 4 years ago
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    |dw:1328405964795:dw|

  43. Mertsj
    • 4 years ago
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    |dw:1328406078466:dw|

  44. Mertsj
    • 4 years ago
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    |dw:1328406166988:dw|

  45. anonymous
    • 4 years ago
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    so for my question here 7k-5=-19 first i going to add -5 to -5 and -19 then rightt?

  46. Mertsj
    • 4 years ago
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    5 is subtracted because it says -5 so you should add 5 to both sides.

  47. anonymous
    • 4 years ago
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    okay

  48. Mertsj
    • 4 years ago
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    Let me draw it for you in a different way

  49. Mertsj
    • 4 years ago
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    |dw:1328406347372:dw|

  50. Mertsj
    • 4 years ago
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    Now divide both sides by 7

  51. anonymous
    • 4 years ago
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    so the answer all together then would be, k=-2

  52. Mertsj
    • 4 years ago
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    |dw:1328406418593:dw|

  53. Mertsj
    • 4 years ago
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    Yes. Good. Do you have another one?

  54. anonymous
    • 4 years ago
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    yeah, 13=4x-11

  55. Mertsj
    • 4 years ago
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    What are you going to do first?

  56. Mertsj
    • 4 years ago
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    |dw:1328406584682:dw|

  57. Mertsj
    • 4 years ago
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    What first to get x alone?

  58. anonymous
    • 4 years ago
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    |dw:1328406584851:dw|

  59. anonymous
    • 4 years ago
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    this right??

  60. Mertsj
    • 4 years ago
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    Wow!1 You are very smart!!

  61. anonymous
    • 4 years ago
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    i just did it??! yay! lol. but.. im still not feeling very confident with it quite yet..

  62. Mertsj
    • 4 years ago
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    Do you have another one?

  63. anonymous
    • 4 years ago
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    okay, this one i have to draw out..

  64. Mertsj
    • 4 years ago
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    ok

  65. anonymous
    • 4 years ago
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    |dw:1328406824918:dw|

  66. Mertsj
    • 4 years ago
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    |dw:1328406896963:dw|

  67. anonymous
    • 4 years ago
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    wait.. so like how would u figure that out.. like first step..

  68. Mertsj
    • 4 years ago
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    |dw:1328407053667:dw|

  69. anonymous
    • 4 years ago
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    so then 3 would go under the 10-7

  70. Mertsj
    • 4 years ago
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    yep

  71. Mertsj
    • 4 years ago
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    |dw:1328407194767:dw|

  72. anonymous
    • 4 years ago
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    then you would divide.. but what would u do to divide in this case?

  73. Mertsj
    • 4 years ago
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    We could divide by 1/2 but did anybody ever teach you that dividing is the same as multiplying by the reciprocal?

  74. anonymous
    • 4 years ago
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    ive heard that

  75. Mertsj
    • 4 years ago
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    So dividing by 1/2 is the same as multiplying by 2. It might be easier to just multiply by 2

  76. Mertsj
    • 4 years ago
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    |dw:1328407410240:dw|

  77. anonymous
    • 4 years ago
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    oh, i kinda see this noww

  78. Mertsj
    • 4 years ago
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    Do you have another one?

  79. anonymous
    • 4 years ago
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    6+n/5=-4

  80. Mertsj
    • 4 years ago
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    |dw:1328407657571:dw|

  81. anonymous
    • 4 years ago
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    so first would you subtract 6 to 6 and the -4?

  82. Mertsj
    • 4 years ago
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    Subtract 6 from both sides.

  83. anonymous
    • 4 years ago
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    -10

  84. Mertsj
    • 4 years ago
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    |dw:1328407833632:dw|

  85. anonymous
    • 4 years ago
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    then what/

  86. Mertsj
    • 4 years ago
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    Well, we could divide by 1/5 or multiply by 5. Which do you choose?

  87. anonymous
    • 4 years ago
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    multiply

  88. Mertsj
    • 4 years ago
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    good choice.

  89. anonymous
    • 4 years ago
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    yeahh so then -10 *5?

  90. Mertsj
    • 4 years ago
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    yep

  91. Mertsj
    • 4 years ago
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    |dw:1328408025248:dw|

  92. anonymous
    • 4 years ago
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    on my math homework now, i just finished 7 problems.. and before your help i couldn't even finish one.. THANKS!!!! :)

  93. Mertsj
    • 4 years ago
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    wonderful!! You keep at it sweetheart, and you'll be a star.

  94. anonymous
    • 4 years ago
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    lol now.. how would u figure this one? w+3w=20

  95. Mertsj
    • 4 years ago
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    Well now they threw us a curve ball, didn't they?

  96. Mertsj
    • 4 years ago
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    But this is easy. Just stay with me and answer by questions which may seem foolish.

  97. anonymous
    • 4 years ago
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    kk

  98. Mertsj
    • 4 years ago
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    What is 1 dog +3 dogs?

  99. anonymous
    • 4 years ago
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    4

  100. Mertsj
    • 4 years ago
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    4 what?

  101. anonymous
    • 4 years ago
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    dogs

  102. Mertsj
    • 4 years ago
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    What is 1 dollar + 3 dollars

  103. anonymous
    • 4 years ago
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    4 dollars

  104. Mertsj
    • 4 years ago
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    Now what if I said that I don't want to write out dollars all the time so I am just going to use d What would 1d + 3d be?

  105. anonymous
    • 4 years ago
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    4d

  106. Mertsj
    • 4 years ago
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    And supposing we would all agree that d means 1d then what would d+3d be?

  107. anonymous
    • 4 years ago
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    4d right?

  108. Mertsj
    • 4 years ago
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    right

  109. Mertsj
    • 4 years ago
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    so now in your problem you have w + 3w What do you suppose that is?

  110. anonymous
    • 4 years ago
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    4w

  111. Mertsj
    • 4 years ago
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    Exactly. So now your problem is 4w=20 How would you solve that?

  112. anonymous
    • 4 years ago
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    divide by 4 so 20 divided by 4 would be 5

  113. Mertsj
    • 4 years ago
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    Good. perfect!!

  114. anonymous
    • 4 years ago
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    so now theres this.. 3(y+5)=21

  115. Mertsj
    • 4 years ago
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    So have you heard of the distributive property?

  116. anonymous
    • 4 years ago
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    yeahh, we did it before.. but i forgot all about it.. but im sure ill remember once i see it again..

  117. Mertsj
    • 4 years ago
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    |dw:1328409800280:dw|

  118. Mertsj
    • 4 years ago
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    Does that look familiar?

  119. anonymous
    • 4 years ago
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    idkk.. not really.. lol

  120. Mertsj
    • 4 years ago
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    |dw:1328409877024:dw|

  121. Mertsj
    • 4 years ago
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    |dw:1328409931974:dw|

  122. anonymous
    • 4 years ago
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    oooh yeahh!

  123. Mertsj
    • 4 years ago
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    you have to "distribute' the 3 to the y and to the 5

  124. anonymous
    • 4 years ago
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    so, 3y+15?

  125. Mertsj
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    Great!!

  126. anonymous
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    6a+7-a+-18

  127. Mertsj
    • 4 years ago
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    Did you get the other one?

  128. anonymous
    • 4 years ago
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    yes i got y=2

  129. Mertsj
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    |dw:1328410272373:dw|

  130. Mertsj
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    That's what I got also.

  131. anonymous
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    okayy cool

  132. Mertsj
    • 4 years ago
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    What about 6a-a+7-18

  133. anonymous
    • 4 years ago
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    soo would that be 5a+7=18?

  134. Mertsj
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    Oh. There's an equal sign. Yes. 6a-a=5a

  135. anonymous
    • 4 years ago
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    okayy

  136. anonymous
    • 4 years ago
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    so a=-5?

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is replying to Can someone tell me what button the professor is hitting...

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