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OpenStudy (anonymous):
if x-y=11, and x^2-y^2=22, what is 5x+5y? please explain step by step!! thanks!
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OpenStudy (anonymous):
x - y = 11 x^2-y^2=(x+y) (x-y) = 11 (x+y) = 22 x+y = 2 5x + 5y = 10
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