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anonymous

  • 4 years ago

Solve the following system of equations. 2x – 3y + z = –1 2x – 2y – 2z = –8 x + 5y – 3z = 2

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  1. anonymous
    • 4 years ago
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    ok lets do this

  2. anonymous
    • 4 years ago
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    first of all we want to eliminate a value

  3. anonymous
    • 4 years ago
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    so you choose 2 of the equations and eliminate z

  4. anonymous
    • 4 years ago
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    (2x-3y+z)2 2x-2y-2z

  5. anonymous
    • 4 years ago
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    4x-6y+2z 2x-2y-2z

  6. anonymous
    • 4 years ago
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    Okay, and then what do you do?

  7. anonymous
    • 4 years ago
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    sec i gorgot the consonate

  8. anonymous
    • 4 years ago
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    4x-6y+2x=-2 2x-2y-2z= -8

  9. anonymous
    • 4 years ago
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    6x-8y=-10

  10. anonymous
    • 4 years ago
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    2x – 3y + z = –1 2x – 2y – 2z = –8 x + 5y – 3z = 2

  11. anonymous
    • 4 years ago
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    so now you take the equation we didnt use and eliminate z

  12. anonymous
    • 4 years ago
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    x+5y-3z = 2 (2x-3y+z=-1)3

  13. anonymous
    • 4 years ago
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    x+5y-3z=2 6x-9y+3z=-3

  14. anonymous
    • 4 years ago
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    7x-4y=-3

  15. anonymous
    • 4 years ago
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    7x-4y=-3 6x-8y=-10

  16. anonymous
    • 4 years ago
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    any questions so far?

  17. anonymous
    • 4 years ago
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    those are the 2 values we get after eliminating the z from equations

  18. anonymous
    • 4 years ago
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    so we can solve for x and y now

  19. anonymous
    • 4 years ago
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    (7x-4y=-3)2 6x-8y=-10

  20. anonymous
    • 4 years ago
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    -2 oops

  21. anonymous
    • 4 years ago
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    thank you soo much! i think i understand this a lot better now

  22. anonymous
    • 4 years ago
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    -14x+8y=6 6x-8y=-10

  23. anonymous
    • 4 years ago
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    -8x=-16

  24. anonymous
    • 4 years ago
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    x=2

  25. anonymous
    • 4 years ago
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    (7x-4y=-3)6 (6x-8y=-10)-7

  26. anonymous
    • 4 years ago
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    42x-24y=-18 -42x+56y=-70

  27. anonymous
    • 4 years ago
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    opps that +70

  28. anonymous
    • 4 years ago
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    32y=52

  29. anonymous
    • 4 years ago
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    y=52/32

  30. anonymous
    • 4 years ago
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    y=13/8

  31. anonymous
    • 4 years ago
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    so lets check our y value

  32. anonymous
    • 4 years ago
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    6x-8y=-10

  33. anonymous
    • 4 years ago
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    plug in x

  34. anonymous
    • 4 years ago
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    6(2)-8y=-10

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