The nice thing about functions and their inverses is that if you know two points, say (a1, b1) and (a_2, b_2), on a function f(x), then two points on its inverse f^(x) need to be (b_1, a_1), and (b_2, a_2). This works out very nicely if we know two points on a line and we want to find the inverse function.

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