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= (x-7)/(13)`

`f^(-1)(x)= (x-7)/(13)`