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mckenzieandjesus

  • one year ago

solve the system using elimination. 5x + 8y = –29 7x – 2y = –67 (–7, 9) (-10, 21/8) (–9, 2) (–1, –3)

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  1. mckenzieandjesus
    • one year ago
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    @jim_thompson5910

  2. Mehek14
    • one year ago
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    we can eliminate y

  3. Mehek14
    • one year ago
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    multiply everything in the second equation by 4

  4. mckenzieandjesus
    • one year ago
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    7*4=28 2*4=8 right?

  5. Mehek14
    • one year ago
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    it's actually -2*4 = -8

  6. mckenzieandjesus
    • one year ago
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    do i multiply -67 too?

  7. mckenzieandjesus
    • one year ago
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    oops yeah

  8. mckenzieandjesus
    • one year ago
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    What do i do next?

  9. Mehek14
    • one year ago
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    yes you multiply -67 * 4

  10. mckenzieandjesus
    • one year ago
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    -268

  11. Mehek14
    • one year ago
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    so \(\bf{5x+8y=-29\\28x-8y=-268}\)

  12. Mehek14
    • one year ago
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    now add 5x +28x = 33x 8y + (-8y) = 0 -29 + (-268) = -279

  13. mckenzieandjesus
    • one year ago
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    ok

  14. mckenzieandjesus
    • one year ago
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    what do I do next?

  15. Mehek14
    • one year ago
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    -29 + (-268) = -297

  16. Mehek14
    • one year ago
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    so 33x = 297 solve for x

  17. mckenzieandjesus
    • one year ago
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    33*9=297 so x=9

  18. Mehek14
    • one year ago
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    yes

  19. Mehek14
    • one year ago
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    wait -297

  20. Mehek14
    • one year ago
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    so x = -9

  21. mckenzieandjesus
    • one year ago
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    oh ok

  22. Mehek14
    • one year ago
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    so (-9,2)

  23. mckenzieandjesus
    • one year ago
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    so its (-9, 2)

  24. Mehek14
    • one year ago
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    yup

  25. mckenzieandjesus
    • one year ago
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    thanku!!

  26. Mehek14
    • one year ago
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    yw :]

  27. mckenzieandjesus
    • one year ago
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    Would u know how to do this? What is the solution of the system of equations? y = –4x + 10 y = –2x – 6 (–2.67, 20.67) (–22, 8) (–2, –2) (8, –22)

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