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math

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3x+y+2z=1
x+2y-z=-8
3x-y-3z=18
after I isolate x what is the 2nd equation

  • math -

    depends on how you isolate x.

    isolate it from the first equation and you have 1/3 * (1-y-2z) + 2y -z = 8
    1-y-2z + 6y -3z = 24
    5y -5z = 23

    Anyway, you end up with (x,y,z) = (15, -6, 11)

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