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Please help, ACT Is close and I need help with this kind of question.

If x^2 - y^2=56 and x-y=8, what is the value of x+y?

A- 10, b-8, c-9 d-7

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Answer:

if you just set x² - y² -56 = 0 then square root x² - y² -56 the answer would be x- y -8 . then move 8 to the right. the final answer is x-y = 8

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