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anonymous

  • 5 years ago

Solve: 2x + 3y + z = -3 x + 4y - 3z = -23 3x - y +2z = 14 I don't even know how to start this problem:(

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  1. anonymous
    • 5 years ago
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    have u learnt Cramer's rule?

  2. anonymous
    • 5 years ago
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    or the matrix method?

  3. anonymous
    • 5 years ago
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    No I have not. At least I don't believe so. I know I need to reduce the problem down to like 2 equations

  4. anonymous
    • 5 years ago
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    then which method would u adopt for the solution?

  5. anonymous
    • 5 years ago
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    we can reduce the equations into two variables n two equtations

  6. anonymous
    • 5 years ago
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    would I need to set the equations equal to zero and factor?

  7. anonymous
    • 5 years ago
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    no u have to eliminate one variable, then solving them simultaneously

  8. anonymous
    • 5 years ago
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    like, we can choose eq 1 and 2 n eliminate x,say

  9. anonymous
    • 5 years ago
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    likewise we can select eq 2 n three, again eliminate x

  10. anonymous
    • 5 years ago
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    we get a et of two eqs in 2 variables

  11. anonymous
    • 5 years ago
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    got it?or u need the solution?

  12. anonymous
    • 5 years ago
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    Can you show me the steps? That would help me a lot.

  13. anonymous
    • 5 years ago
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    I am studying for my final and this is a practice problem I am doing, I just can't figure it out.

  14. anonymous
    • 5 years ago
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    multiply eq 2 with 2 and subtract eq 1 and 2 2x+3y+z=-3 2x-2y+4z=28 ---------------------- 5y-3z=-31(on subtraction)

  15. anonymous
    • 5 years ago
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    right?

  16. anonymous
    • 5 years ago
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    similarly multiplying eq 2 by 3 and subtracting 2 and 3

  17. anonymous
    • 5 years ago
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    3x+12y-9z=-69 3x-y+2z=14 --------------- -13y-11z=-83

  18. anonymous
    • 5 years ago
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    is it ok?

  19. anonymous
    • 5 years ago
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    yes, Thank you.

  20. anonymous
    • 5 years ago
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    now there r two equations in two variables u can use either substitution method or elimination method

  21. anonymous
    • 5 years ago
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    2x+3y+z=-3 2x+8y-6z=-46 --------------- -5y+7z=-43

  22. anonymous
    • 5 years ago
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    i missed the multiplication by 2 first :(

  23. anonymous
    • 5 years ago
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    I don't know, its just still very confusing to me. So can you go back to the beginning..... I have 2x + 3y + z = -3 but where did the equation blow it come from?

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spraguer (Moderator)
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