11/18/15

I need some help!!!!!! solve by substitution: x - y + 2z = -7, y + z = 1, and x - 2y - 3z = 0.
x - y + 2z = -7 y + z = 1 x - 2y - 3z = 0   Write your answer as a point, an ordered triple: (x,y,z), without spaces
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