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smartgirl101

Solve the system of equations and give your answer as an ordered pair: 3y + 2x = 17 -x - 4y = -21

  • 2 years ago
  • 2 years ago

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  1. precal
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    what method would you like to use?

    • 2 years ago
  2. smartgirl101
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    it's either substitution or elimination

    • 2 years ago
  3. precal
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    which do you like?

    • 2 years ago
  4. smartgirl101
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    elimination

    • 2 years ago
  5. precal
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    ok do you want to cancel out the x's or the y's? Tell me what number you are going to multiply to which equation?

    • 2 years ago
  6. smartgirl101
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    the x's second equation

    • 2 years ago
  7. precal
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    ok you might want to rewrite the equations so that the x and y are underneath each other

    • 2 years ago
  8. precal
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    |dw:1333569378906:dw|

    • 2 years ago
  9. precal
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    what number do you multiply to equation 2 to make the x's cancel out

    • 2 years ago
  10. smartgirl101
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    1

    • 2 years ago
  11. precal
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    no

    • 2 years ago
  12. smartgirl101
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    3

    • 2 years ago
  13. precal
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    no

    • 2 years ago
  14. smartgirl101
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    6

    • 2 years ago
  15. precal
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    |dw:1333569507506:dw|

    • 2 years ago
  16. smartgirl101
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    2

    • 2 years ago
  17. precal
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    yes

    • 2 years ago
  18. smartgirl101
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    i thought about putting that

    • 2 years ago
  19. precal
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    |dw:1333569548378:dw|

    • 2 years ago
  20. precal
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    ok distribute the 2 to everything in the ( ), what do you get? You can reply using my drawing, click on the pencil on the upper right hand side

    • 2 years ago
  21. smartgirl101
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    |dw:1333569528644:dw|

    • 2 years ago
  22. precal
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    yes

    • 2 years ago
  23. precal
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    |dw:1333569714680:dw|

    • 2 years ago
  24. precal
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    add both equations together and what do you get?

    • 2 years ago
  25. precal
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    I can help you for about 10 more minutes then I have to go

    • 2 years ago
  26. smartgirl101
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    |dw:1333569715202:dw|

    • 2 years ago
  27. precal
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    |dw:1333569888166:dw|

    • 2 years ago
  28. precal
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    |dw:1333569913840:dw|

    • 2 years ago
  29. smartgirl101
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    |dw:1333569795605:dw|

    • 2 years ago
  30. precal
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    recall 2x and -2x make the x's go away

    • 2 years ago
  31. precal
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    I did not understand what you wrote , -5y=-25 so what is y?

    • 2 years ago
  32. smartgirl101
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    5

    • 2 years ago
  33. precal
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    yes y=5

    • 2 years ago
  34. precal
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    |dw:1333570054041:dw|

    • 2 years ago
  35. precal
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    can you solve for x now?

    • 2 years ago
  36. precal
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    I will be leaving soon, I have a couple of more minutes left

    • 2 years ago
  37. precal
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    |dw:1333570362931:dw|

    • 2 years ago
  38. precal
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    x=-1 y=5 solution is (-1, 5)

    • 2 years ago
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