If a function is defined by the equation...

The inverse  reverses the coordinates  on the original graph

So.....on the original graph   we have the points

 x      y

-1    1/4

0       1

1       4

So...on the inverse.....we have the points

x        y

1/4    - 1

1         0

4         1

Notice that  graph (2)  is the only one possible