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OpenStudy (anonymous):
x+y=7,x+y=-7 solve by elimination
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OpenStudy (anonymous):
x+y=7 x+y=-7 There is no solution
OpenStudy (anonymous):
x+y=7 -1(x+y...-7) = -x-y=7 ------------------- x+y=7 -x-y=7 0=7 no solution
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