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Math Help - Elimination Method

  1. #1
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    Elimination Method

    2x-y 3z=-1;-4x 2y-6z=2 by gauss elimination and back substitution
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  2. #2
    MHF Contributor Unknown008's Avatar
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    Could you re-post your equations? There are two equations with three unknowns and the '+' signs didn't appear, if there were any.
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  3. #3
    Senior Member Educated's Avatar
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    1. 2x-y 3z=-1

    2. -4x + 2y-6z=2

    I'm guessing it's a +2y and +3z

    Here, double equation 1, 2x-y 3z=-1 to get 4x-2y + 6z=-2
    Or conversely you could halve equation 2.

    Then you have:

    1. 4x -2y + 6z=-2

    2. -4x + 2y -6z=2


    Wait... here I find that both equations are the exact same... You can't solve a simultaneous eauation if both of them are the same.
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