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Posted by **donald** on Friday, October 7, 2011 at 8:42pm.

x+2y-z=-8

3x-y-3z=18

after I isolate x what is the 2nd equation

- math -
**Steve**, Saturday, October 8, 2011 at 12:41amdepends 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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