Question

How do you find the inverse of `y = 5x + 20`?

Answer 1

`If f(x)=5x+20, then f^(-1)(x)=(x-20)/5`

Explanation:

By definition of the inverse function,
`y=f^(-1)(x)iff f(y)=x`

`iff 5y+20=x`

`iff y=(x-20)/5`