x=y-8 and -x-y=0 you suppose to be solving system using substitution
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Expert's answer
2012-01-31T08:44:01-0500
Substitute x which is given by the first equation( x=y-8) into the second equation: -(y-8)-y=0 now open the braces . As long as "-" is before the braces we should change the sign of terms inside the braces when opening them: -y+8-y=0 -2y+8=0 2y=8 y=4 now find x from the first equation by substituting y=4: x=4-8=-4 Thus the answer is x=-4, y=4
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