Given the function f(x)=(6)/(x+4)find a formula for the inverse function

Question

I say it is f^-1 (x)=(6)/(x-4)

Answer 1

y = 6/(x+4)

x = 6/(y+4)
x y + 4x = 6
x y = 6-4x
y = (6-4x)/x

Answer 2

So what would this = ?

What i said? f^-1(x)(6) over (x - 4)