Question

Which function below is the inverse of f(x) = The quantity of seven x plus one, over two.?

Answer 1

$$y=\frac{7x+1}{2}$$
solve for x

Answer 2

After solving for x, interchange x and y. That is, replace x with y and y with x.

Answer 3

You don't have to interchange the variable names. It is acceptable to use y as a parameter to an inverse function.