It is then x/y when simplified
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x(y - 1)(y + 1)
x+y
It is x^2 + xy + y^2
The answer? There is no "answer" There cannot be an answer because they are all different. In order to make calculations, the variables have to be the same. x squared, xy, y squared are the variables, and none of them match. Therefore your "answer" must look like this: 9x squared - 6xy + y squared - 81. Hope I Helped :D
None of the graphs that I can see!