The functions are  and  where .

A function  is the inverse of the function  if  for each  in the domain of  and for each  in the domain of .

Since , the functions  and  are inverse functions.

Draw a coordinate plane.

Graph the functions  and .

Graph :

Observe the graph :  and  have reflective property.

And the graphs of the two functions symmetric about the line .

Hence the functions  and  are inverse functions of each other.

 and  are inverse functions.