Question

If f(x) = 5x + 4, which of the following is the inverse of (fx)?​

Answer 1

see explanation

Explanation:

let y = f(x) and rearrange making x the subject, that is

y = 5x + 4 ( subtract 4 from both sides )

y - 4 = 5x ( divide both sides by 5 )

`(y-4)/(5)` = x

Change y back into terms of x

`f^(-1)` (x) =
`(x-4)/(5)`