How do you find the inverse of $f(x)=9 x-4$ and is it a function?

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Answer 1 · 2016-08-12T17:30:34

$g(x) = (x+4)/9$

The inverse of $f(x)=9 x-4$ is a function $g(x)$ such that

$f(g(x))=(f@g)(x) = x$

but

$f(g(x)) = 9 g(x)-4 = x$ then

$g(x) = (x+4)/9$

How do you find the inverse of f(x)=9 x-4f(x)=9 x-4 and is it a function?