Answer
A graph consists of points (x, f(x)).
The y-coordinate is the function value of the x-coordinate.
If (3,5) is a point on the graph, then $f(3)=5.$
Also, $f^{-1}(5)=3$
Work Step by Step
A graph consists of points (x, f(x)).
The y-coordinate is the function value of the x-coordinate.
If (3,5) is a point on the graph, then $f(3)=5.$
Also, if f is one-to-one, then $x=3$ is the only x value that has function value of 5.
This means that $f^{-1}(5)=3$,
because $f^{-1}(f(x))=x, $
for x=3, $f^{-1}(f(3))=3, $
that is, $f^{-1}(5)=3$