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x^2-y^2=8 y=x-4
Quote: Originally Posted by jimC x^2-y^2=8 y=x-4 Since you want elimination, we have that (x + y)(x - y) = 8 So from the other equation x - y = 4 and x + y = 2x - 4 Putting these in we get (2x - 4) * (4) = 8 -Dan
