Question

F(x) 4x+7
F-1(y)= ?

Answer 1

just peel it back to get the x

(y-7)/4

Answer 2

so right now we have y = 4x+7, so lets solve for x:
\[y = 4x+7 \Rightarrow y-7 = 4x \Rightarrow \frac{y-7}{4} = x\]
and your done :)

Answer 3

y=4x+7
x=4y+7
x-7=4y\[F^{-1}(y)=\frac{1}{4}x-\frac{7}{4}\]