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solve the system by elimination.

  • math -

    Multiply the last equation (both sides) by 2. That gives you
    4x + 6y - 4z = 18
    Add that to
    6x - 6y - 4z = -10
    That gives you
    10x -8z = 8
    So far, we have eliminated the variable y.
    Use similar tricks to get rid of x or z.

    I believe your second equation is typed incorrectly. Did you mean
    -5x +4y -z = -12?

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