Let f(x) = 2x - 6 solve f-1(x) when x = 2.

This is an inverse function, so first we have to flip x and y:

y = 2x - 6
x = 2y - 6

Now, let’s substitute 2 into the equation:

2 = 2y - 6

Solve:

8 = 2y
y = 4

Hope this helped!