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anonymous

  • 5 years ago

I need some guidance: solving the system. 4x-y+3z=-2 3x+5y-z=15 -2x+y+4z=14

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  1. anonymous
    • 5 years ago
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    I know that I need to elimante y. So I took the 1st and 3rd equation and added them.

  2. anonymous
    • 5 years ago
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    4x-y+3z=-2 -2x+y+4z=14 ________________ 2x+7z=12

  3. anonymous
    • 5 years ago
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    Then I did 2 and 3rd equations: 3x+5y-z=15 3x+5y-z=15 -2x+y+4z=14 10x-5y-20z=-70 _________________ ____________________ 13x-21z=-55

  4. anonymous
    • 5 years ago
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    now use the two equations that you got 2x+7z=12 13x-21z=-55 to solve for one of the variables (x or z) and go on and solve each variable one by one

  5. anonymous
    • 5 years ago
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    Then I need to take my answers from the first and second and add them together. 2x+7z=12 6x+21=12 13x-21z=-55 13x-21z=-55 _________________ Then I get lost?

  6. anonymous
    • 5 years ago
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    its suppose to be 36 at the end of the equation... let me see.

  7. anonymous
    • 5 years ago
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    (-1,4,2)

  8. anonymous
    • 5 years ago
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    you mean, you solved for x and your answer is wrong? oO

  9. dumbcow
    • 5 years ago
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    looks good so far... 6x +21z = 36 13x-21z =-55 ________________ 19x = -19 x = -1

  10. anonymous
    • 5 years ago
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    yeah i think dumbcow got it just keep plug and solve-ing dumbcow...when i say your name i feel i'm like making fun of you...i'm sory :x

  11. dumbcow
    • 5 years ago
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    (-1,4,2) is correct @ chiaroscuro dont worry about, its an inside joke ;)

  12. anonymous
    • 5 years ago
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    Thanks Y'all!!!

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