Answer
The graph of the inverse function is a reflection of that of the original function in the graph of the identity function (y =x)
Work Step by Step
Graph of $f^{-1}$ is a reflection of the graph of $f$ in the line described by y=x.
Let the graph of $f$ contain a point, say (a, b) then -and only then- the graph of $f^{-1}$ will contain the point (b, a). This is so because if the graph of $f$ contain (a, b), that means $ f(a) = b$ which implies $f^{-1}(b)=a$ which in turn implies that the graph of $f^{-1}$ will contain the point (b, a)
