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OpenStudy (anonymous):
solve using substitution?? y=-2x-3 x+y=9
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jimthompson5910 (jim_thompson5910):
x+y=9 ... start with the second equation x+(-2x-3)=9 ... replace y with -2x-3 (since y = -2x-3) x-2x-3=9 -x-3 = 9 I'll let you finish up
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