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Math Help - Guassian elimination to solve system

  1. #1
    Junior Member
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    Jan 2009
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    Guassian elimination to solve system

    2x+3y-z=4 converting this into an augmented matrix and into echelon form
    4x-2y+3z=-7
    -6x+7y-7y=3
    =
    [1 1.5 -.5 2]
    [0 1 -.8 2.2]
    [0 0 1 8.9]

    the answer i got was x= -7.5 y=9.3 z= 8.9
    anyone care to solve this and check my answer?
    many thanks!
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  2. #2
    Super Member Showcase_22's Avatar
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    Your answer works for the first equation, but for the second:

    4(-7.5)-2(9.3)+3(8.9)=-21.9 \neq -7

    Check your matrix in RRF, it doesn't look right....
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