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mlbach

13x=7x+5

  • one year ago
  • one year ago

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  1. PhoenixFire
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    Solve for x?

    • one year ago
  2. mlbach
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    yes, i dont even know where to start!!!!

    • one year ago
  3. zzr0ck3r
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    subtract 7x from both sides and tell me what you got

    • one year ago
  4. rainbow22
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    5/6

    • one year ago
  5. rainbow22
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    =x

    • one year ago
  6. zzr0ck3r
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    @rainbow dont just give answers. Please read rules.

    • one year ago
  7. PhoenixFire
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    \[13x=7x+5\] Subtract 7x from both sides. \[13x-7x=7x-7x+5\] Combine like terms \[6x=5\] Divide both sides by 6 \[x={5 \over 6}\]

    • one year ago
  8. zzr0ck3r
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    we are not saposed to give them the answers, you should involve them in getting the answer...

    • one year ago
  9. PhoenixFire
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    Sorry @zzr0ck3r I'll remember for next time.

    • one year ago
  10. mlbach
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    AHHHHH..Thank you so much Phoenixfire for explaining!!!

    • one year ago
  11. mlbach
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    X-2/5=1/2

    • one year ago
  12. mlbach
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    how would i start this one?

    • one year ago
  13. PhoenixFire
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    Add 2/5 to both sides. What do you get?

    • one year ago
  14. mlbach
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    im horrible at this!!! add 2/5 to 2/5 and 1/2?

    • one year ago
  15. PhoenixFire
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    Yes. type out the entire equation with 2/5 added to both sides.

    • one year ago
  16. PhoenixFire
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    @mlbach Did you get it?

    • one year ago
  17. mlbach
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    no, im sorry, trying to do it on paper

    • one year ago
  18. mlbach
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    im 38 and math is like a foreign language to me!

    • one year ago
  19. PhoenixFire
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    You have \[x-{2 \over 5}={1 \over 2}\] So, add 2/5. You get: \[x-{2 \over 5}+{2 \over 5}={1 \over 2}+{2 \over 5}\] Try solve from there.

    • one year ago
  20. mlbach
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    x-4/5=9/10

    • one year ago
  21. mlbach
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    is that right...9/10

    • one year ago
  22. PhoenixFire
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    You can see that the -2/5+2/5 results in 0. \[x-0={1 \over 2}+{2 \over 5}\] But you got the right hand side correct.

    • one year ago
  23. mlbach
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    ok, they cancel each other out right?

    • one year ago
  24. PhoenixFire
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    Correct! So, \[x={9 \over 10}\]

    • one year ago
  25. mlbach
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    YAY!!!!! thank you!!!

    • one year ago
  26. PhoenixFire
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    No problem. :) Any other problems?

    • one year ago
  27. mlbach
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    2/7X=6

    • one year ago
  28. PhoenixFire
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    \[{2 \over 7}x=6\] Divide both sides by 2/7. The one the left will cancel and then you're left with x=??

    • one year ago
  29. mlbach
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    how do i know that im dividing?

    • one year ago
  30. PhoenixFire
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    \[{2 \over 7}x=6\] Divide by 2/7\[{{{2 \over 7}x} \over {2 \over 7}}={6 \over {2 \over 7}}\]

    • one year ago
  31. PhoenixFire
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    \[{{2 \over 7} \over {2 \over 7}}=1\] Do you understand that? Anything divided by itself is 1.

    • one year ago
  32. mlbach
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    yes

    • one year ago
  33. mlbach
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    i just dont know how to do 6 divided by 2/7

    • one year ago
  34. PhoenixFire
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    So, that leave \[1x={6 \over {2 \over 7}}\] Now, a trick is to dividing by fractions: \[{a \over {b \over c}}={{c \over b}a}\] You flip the bottom fraction and multiply the top by it. Giving you: \[{6 \over {2 \over 7}}={7 \over 2}6\] Or \[{7*6} \over 2\]

    • one year ago
  35. PhoenixFire
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    Sorry about the bad grammar.. That was truly horrible.

    • one year ago
  36. mlbach
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    21?

    • one year ago
  37. PhoenixFire
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    Yes! \[x=21\]

    • one year ago
  38. mlbach
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    can i just put you in my pocket and and take you to class with me?

    • one year ago
  39. PhoenixFire
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    Hahaha. Yes, if you have a cell phone and internet on it. :)

    • one year ago
  40. mlbach
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    lol

    • one year ago
  41. mlbach
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    A telephone book has white pages and yellow pages. ¾ of the book consists of the white pages; the yellow pages number 300. What is the total number of pages in the telephone book?

    • one year ago
  42. mlbach
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    how would i start this one

    • one year ago
  43. PhoenixFire
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    White=3/4 of the book Yellow=1/4 of the book. So, if 1/4 of the book is 300. How many total pages are there?

    • one year ago
  44. mlbach
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    900

    • one year ago
  45. PhoenixFire
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    Almost. Y=yellow=1/4=300 W=white=3/4=300*3 T=total=W+Y=(300*3)+300=1200

    • one year ago
  46. mlbach
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    ah. i got it

    • one year ago
  47. mlbach
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    A theater usher at a Broadway musical finds that ½ of the patrons attending a performance are in their seats by show time. The remaining 60 people are seated after the opening number. If the show is always a complete sellout, how many seats does the theater have?

    • one year ago
  48. PhoenixFire
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    This one is mostly a play on words. If you single out a few words: "1/2", "remaining", "sellout" From this you can see that "sellout" says all seats are taken. "remaining" means those not seated initially. "1/2" the initial people seated. So, if "half" of the attendees are seated before the show, and the "remaining" are seated after the first number. How many seats are there in the theater which is "sold out (ie all seats taken)"?

    • one year ago
  49. PhoenixFire
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    *** "remaining 60" ***

    • one year ago
  50. mlbach
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    120?

    • one year ago
  51. PhoenixFire
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    Correct!

    • one year ago
  52. mlbach
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    YAY!!!! lol

    • one year ago
  53. PhoenixFire
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    Getting the hang of it?

    • one year ago
  54. mlbach
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    right now i am, but come test time, I'll draw a blank!

    • one year ago
  55. mlbach
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    Of those invited to a wedding, 2/7 were friends of the bride. The friends of the groom numbered 65. How many people were invited to the wedding

    • one year ago
  56. PhoenixFire
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    Haha. Of course. Nobody can avoid the blank come test time.

    • one year ago
  57. mlbach
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    unfortunatley not!

    • one year ago
  58. mlbach
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    what do i look at first?

    • one year ago
  59. PhoenixFire
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    bride=2/7 Therefore, groom=5/7=65 You can take this known number as a percentile of the total attendees. \[{5 \over 7}T=65\] Where T= the total number of people attending. Now solve for T.

    • one year ago
  60. mlbach
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    where did you get 5/7 from?

    • one year ago
  61. PhoenixFire
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    Well if the brides guests are 2/7 of the attending people. then the grooms is the remaining guests. Correct? so 1-2/7 = 5/7

    • one year ago
  62. mlbach
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    oh ok

    • one year ago
  63. PhoenixFire
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    To solve for T you use the same method as one of the other problems above. The funny trick with dividing by fractions.

    • one year ago
  64. PhoenixFire
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    Got it yet?

    • one year ago
  65. mlbach
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    not quite

    • one year ago
  66. PhoenixFire
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    What are you stuck on?

    • one year ago
  67. mlbach
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    5/7T=65....i get stuck on how to work the problem out

    • one year ago
  68. PhoenixFire
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    Well you want to isolate T. Because that's the unknown variable that you want to become known. So in this case, the only way to do that is to remove the 5/7 from T. You will want to divide by 5/7 to make it cancel out, leaving T alone on the left.

    • one year ago
  69. mlbach
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    so do i divide both sidesby 5/7?

    • one year ago
  70. mlbach
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    answer is 91?

    • one year ago
  71. PhoenixFire
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    Yes. Because if you change the equation on the left, you have to change it in the same way on the right for the equality to hold. 91 is correct!

    • one year ago
  72. mlbach
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    awesome!!!!

    • one year ago
  73. mlbach
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    thank you so much for your help, I appreciate it!

    • one year ago
  74. PhoenixFire
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    No problem at all. Become a fan of me, and if you need help just send me a message.

    • one year ago
  75. mlbach
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    Done!

    • one year ago
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