Answer
$(9, 2)$
Work Step by Step
RECALL:
If the points (a, b) is a solution to $f(x)$, then the point (b, a) is a solution to its inverse.
Thus, since $(2, 9)$ is a solution to $f(x)$, then the point $(9, 2)$ is a solution to the inverse of $f(x)$.
