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Phebe

  • one year ago

HELPZZ http://prntscr.com/7sq0eu

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  1. laughoutloud
    • one year ago
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    Do you know what two methods there are?

  2. Phebe
    • one year ago
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    No well one is the matrix method i think

  3. Phebe
    • one year ago
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    @Chumpian

  4. laughoutloud
    • one year ago
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    There is elimination and substitution

  5. Phebe
    • one year ago
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    okay thanks

  6. Phebe
    • one year ago
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    I just need to know how to do the problem

  7. laughoutloud
    • one year ago
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    ok for A) 3x-9y=3 6x-3y=-24 Solve the first equation for x

  8. Phebe
    • one year ago
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    ok so -9 on both sides?

  9. laughoutloud
    • one year ago
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    add 9y on both sides

  10. Phebe
    • one year ago
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    ok like this|dw:1436908249151:dw|

  11. laughoutloud
    • one year ago
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    yes

  12. Phebe
    • one year ago
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    so 3+9=12|dw:1436908316517:dw|

  13. Phebe
    • one year ago
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    at the bottom those are 3's

  14. laughoutloud
    • one year ago
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    ok so the first equation look like this. 3x=3+9y

  15. Phebe
    • one year ago
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    Yes

  16. laughoutloud
    • one year ago
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    great so divide 3 by both sides

  17. Phebe
    • one year ago
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    ok hold on

  18. Phebe
    • one year ago
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    |dw:1436908667158:dw|

  19. laughoutloud
    • one year ago
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    k so when simplified we get x=1+3y

  20. Phebe
    • one year ago
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    where you get that from?

  21. laughoutloud
    • one year ago
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    |dw:1436908850564:dw|

  22. Phebe
    • one year ago
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    okay i see

  23. Phebe
    • one year ago
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    so what i do next

  24. laughoutloud
    • one year ago
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    plug the equation into the second one like this 6(1+3y)-3y=-24

  25. Phebe
    • one year ago
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    an then solve?

  26. laughoutloud
    • one year ago
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    yes solve for y

  27. Phebe
    • one year ago
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    ok

  28. Phebe
    • one year ago
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    |dw:1436909266839:dw| which one i isolate?

  29. laughoutloud
    • one year ago
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    ok so distribute out the 6

  30. Phebe
    • one year ago
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    |dw:1436909395652:dw|

  31. laughoutloud
    • one year ago
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    when you do that you get 6+18y-3y=-24

  32. laughoutloud
    • one year ago
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    |dw:1436909525038:dw|

  33. Phebe
    • one year ago
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    |dw:1436909655173:dw| right?

  34. laughoutloud
    • one year ago
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    no subtract the 6

  35. Phebe
    • one year ago
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    omg ok

  36. Phebe
    • one year ago
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    |dw:1436909740180:dw|

  37. laughoutloud
    • one year ago
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    |dw:1436909811890:dw|

  38. Phebe
    • one year ago
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    OH that kinda looks easy so the first equation is -2 right?

  39. laughoutloud
    • one year ago
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    no there's more lol y=-2 now plug in -2 for y in the first equation

  40. Phebe
    • one year ago
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    ok lol T.T

  41. Phebe
    • one year ago
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    Can you show me i dont know where to put it

  42. laughoutloud
    • one year ago
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    |dw:1436910047668:dw|

  43. Phebe
    • one year ago
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    so now i just put that the answer is -2 and -5?

  44. laughoutloud
    • one year ago
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    yes but write it like this (-5,-2)

  45. Phebe
    • one year ago
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    OKAY DANG THANK YOU! I BEEN WORKING ON THIS FOR 2 DAYS LOL

  46. Phebe
    • one year ago
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    can you help me with part B?

  47. laughoutloud
    • one year ago
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    sure

  48. Phebe
    • one year ago
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    thanksz! do u still got the problem?

  49. laughoutloud
    • one year ago
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    yes we are going to solve this one using elimination because it is quicker for this problem we solved the last one using substitution

  50. Phebe
    • one year ago
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    did we use elimination for the last one i think it was substitution

  51. laughoutloud
    • one year ago
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    no we used substituion

  52. Phebe
    • one year ago
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    OK i knew it thanksz

  53. laughoutloud
    • one year ago
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    we are going to solve this one together like this |dw:1436910768080:dw|

  54. Phebe
    • one year ago
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    thats matrix right?

  55. laughoutloud
    • one year ago
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    no the 3y cancels out

  56. Phebe
    • one year ago
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    |dw:1436911023546:dw| and then we just move over the rest of the problem?

  57. laughoutloud
    • one year ago
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    yes! add the two equations together like this |dw:1436911155428:dw|

  58. Phebe
    • one year ago
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    and then we put x=3 in the problem?

  59. laughoutloud
    • one year ago
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    yes plug it into either equation you can choose

  60. Phebe
    • one year ago
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    ok let me see

  61. Phebe
    • one year ago
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    |dw:1436911318766:dw|

  62. laughoutloud
    • one year ago
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    ok |dw:1436911428534:dw|

  63. laughoutloud
    • one year ago
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    so your answer for part b is |dw:1436911673328:dw|

  64. Phebe
    • one year ago
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    OMG!!!!!!!! THANK YOU!

  65. laughoutloud
    • one year ago
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    np do you want help with part c?

  66. Phebe
    • one year ago
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    OH yea i almost forgot lol

  67. laughoutloud
    • one year ago
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    lol We are going to solve this one using substitution

  68. Phebe
    • one year ago
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    ok ima put that

  69. laughoutloud
    • one year ago
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    I substituted y into the second equation |dw:1436911880872:dw|

  70. Phebe
    • one year ago
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    |dw:1436912011827:dw|

  71. laughoutloud
    • one year ago
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    not quite we have to distribute the 6 like this |dw:1436912140467:dw| I multiplied the six into the parenthesis

  72. laughoutloud
    • one year ago
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    now we can add 36 to each side

  73. Phebe
    • one year ago
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    |dw:1436912247899:dw| RIGHT

  74. laughoutloud
    • one year ago
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    yes

  75. laughoutloud
    • one year ago
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    so whats your new problem?

  76. Phebe
    • one year ago
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    |dw:1436912323688:dw|

  77. laughoutloud
    • one year ago
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    Correct |dw:1436912410251:dw|

  78. laughoutloud
    • one year ago
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    now plug in the x value into the first equation

  79. Phebe
    • one year ago
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    ok

  80. Phebe
    • one year ago
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    |dw:1436912516544:dw|

  81. laughoutloud
    • one year ago
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    |dw:1436912554603:dw|

  82. Phebe
    • one year ago
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    so +6 on both ends right

  83. laughoutloud
    • one year ago
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    actually we can just solve this by multiplying 11 and (1/2) then subtracting 6 |dw:1436912738685:dw|

  84. laughoutloud
    • one year ago
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    so the answer to part c is |dw:1436912878418:dw|

  85. Phebe
    • one year ago
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    THANKSZZ!!

  86. laughoutloud
    • one year ago
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    No problem:)

  87. Phebe
    • one year ago
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    <3

  88. Phebe
    • one year ago
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    i should get a 100%

  89. Phebe
    • one year ago
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    well ima go so CYA~ thanks for all tha helpz

  90. laughoutloud
    • one year ago
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    Yep!

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