(a(i))[3]
Determine an expression for $f^{-1}(x)$ and locate the point where the graphs of $y = f(x)$ and $y = f^{-1}(x)$ intersect.
(a(ii))[3]
On one diagram, sketch the graphs of $y = f(x)$ and $y = f^{-1}(x)$, and make the relationship between the two graphs clear.