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Answer on Algebra Question for Zhane' Soldiew

Question #6225
x=y-8 and -x-y=0 you suppose to be solving system using substitution
Expert's answer
Substitute x which is given by the first equation( x=y-8) into the second equation:
now open the braces . As long as "-" is before the braces we should change the sign of terms inside the braces when opening them:
now find x from the first equation by substituting y=4:
Thus the answer is x=-4, y=4

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