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OpenStudy (anonymous):
solve by elimination or substitution: x^2-y^2=15 and x+y=1
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OpenStudy (anonymous):
x^2-y^2=(x+y)(x-y)=15 and we have x+y=1 so 1x15=15 so x-y=15 (x-y)+(x+y)=2x=15+1 so x=8 y=-7
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