Posted by **mike** on Saturday, December 19, 2009 at 4:23pm.

I need to solve the system of equations letting z be the parameter

7x+y+7z=-12

-3x+4y+6z=-1

This is suppose to be the right answer

{-47/31-22/31z-43/31-63/31z,z}

I keep getting

{-22/31-47-31z-63/31-43/31z,z}

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