Question

find the inverse of f(x)=2x-8

Answer 1

x=2y-8 2y=x+8 y=(x+8)/2

Answer 2

function says
a) multiply by 2
b) subtract 8

inverse says
a) add 8
b) divide by 2

so it is
\[f^{-1}(x)=\frac{x+8}{2}\]
like if you were solving
\[2x-8=20\]

Answer 3

thanks alot