The graph of the invertible function f is shown on the grid below
What is the value of f^-1(6)

Given:

The graph of an invertible function is given.

To find:

The value of .

Solution:

We know that, if the graph of an invertible function passes through the point (a,b), then the inverse function passes through the point (b,a).

From the given graph it is clear that the graph of the function passes through the points .

So, the inverse function must be passes through the point .

Therefore, the value of inverse function is at . So, the value of is .