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AonZ

  • one year ago

Simutaneosly solve x-5y-z=13 2x+y+z=0 -3x+y+2z=11

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  1. AonZ
    • one year ago
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    I know how to solve 2 simutaneous equations but no idea about 3

  2. AonZ
    • one year ago
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    i rather the elimination method :P

  3. hartnn
    • one year ago
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    ok, so if i help you get 2 equations in x and y only , will you be able to solve the rest ? 1) Add 1st and 2nd equation, what u get ?

  4. AonZ
    • one year ago
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    3x-4y=13

  5. AonZ
    • one year ago
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    i just need the steps in which to complete it i think

  6. hartnn
    • one year ago
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    now multiply 1st equation by 2

  7. AonZ
    • one year ago
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    6x-8y=26

  8. hartnn
    • one year ago
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    :O how ?

  9. AonZ
    • one year ago
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    2x-10y-2z=26

  10. hartnn
    • one year ago
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    now add it with 3rd equation.....

  11. AonZ
    • one year ago
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    -x-9y=37 Btw does it matter if you add the 2nd to the 3rd eqution instead of 1st to 3rd?

  12. hartnn
    • one year ago
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    if you add 2nd and 3rd equation, you could not have eliminated 'z'

  13. hartnn
    • one year ago
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    now can you find 'x' and 'y' ?

  14. AonZ
    • one year ago
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    y=-4?

  15. AonZ
    • one year ago
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    x=-1

  16. hartnn
    • one year ago
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    yes.

  17. hartnn
    • one year ago
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    now can u find z ?

  18. AonZ
    • one year ago
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    mhm... I sub x and y into the 1,2,3 equation?

  19. AonZ
    • one year ago
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    ok z =6 thank you

  20. hartnn
    • one year ago
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    yes, correct :) ask if any doubts.

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