Question

Let f(x) = 7x - 13. Find f^-1(x).

Answer 1

to get the inverse you want to make x the subject

let's let f(x)=y

so we get
y=7x-13

y+13=7x
divide by 7

(y+13)/7=x

then you replace y with x, and let x be f^-1(x) to get
(x+13)/7=f^-1(x)

Answer 2

Oh okay. Thank you.

Answer 3

dot.