Question

Let f(x)=13x+7. Find f−1(x).

Answer 1

replace f(x) with y
switch x andn  y
solve for y
replace y with f⁻¹(x)

f(x)=13x+7
y=13x+7
x=13y+7
x-7=13y
$y= \frac{x-7}{13}$
$f^{-1}(x)= \frac{x-7}{13}$