1) y=9/x x=9/y xy=9 y=9/x Which is wrong I believe 2) y=(2x+1)/(3-2x) How do I get rid of the ys after I replace the xs with them?
since f^-1(f(x)) = 9/(f(x)) = 9/(9/x) = x swap variables and solve for y: x = (2y+1)/(3-2y) x(3-2y) = 2y+1 3x-2xy = 2y+1 3x-1 = 2xy+2y 3x-1 = y(2x+2) y = (3x-1)/(2x+2)
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