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OpenStudy (anonymous):
solve each system of equations by substitution x-y=1 x+y=-1
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OpenStudy (anonymous):
1. Set one equation to y 2. Substitute the y in the other equation. 3. Solve
OpenStudy (anonymous):
x-y=1 ---> y=x-1 x+ (x-1) =-1 2x-1=-1 2x=0 x=0
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