g(x) = x/2
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fx=5x1 / 9
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To find the inverse of a function, you replace x with y and y with x. Here, y=2x-4 would become x=2y-4. Now, we solve for y. 2y=x+4. y=(x/2)+4, and that is the inverse equation.
The inverse is the opposite. If you're using 'x' it will change to division.