Auto Collision Repair And Refinishing Practice Test

For nonzero x and y with x not equal to y, simplify (1/x + 1/y)/(1/x - 1/y).

(x + y)/(y - x) (x - y)/(x + y) (xy)/(x - y) (x + y)/(xy)

(x + y)/(y - x)

The numerator is (x + y)/(xy) and the denominator is (y - x)/(xy). Dividing cancels xy, leaving (x + y)/(y - x).

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