Will mark brainliest if answer is correct

Both of them are not functions

Step-by-step explanation:

In the first one you can see that the numbers repeat (You can't have that in a function)

And the second one is a circle, which can never be a function.

To find the inverse of a function, replace f(x) with y

y=4x

Interchange the variables

x=4y

Solve.

y=(1/4)x

Replace y with g(x) because it's a different function.

g(x)=(1/4)x