Question 690415
f(x)=3x+7


y=3x+7


x=3y+7


x-7=3y


(x-7)/3=y


y = (x-7)/3


So the inverse is <img src="http://latex.codecogs.com/gif.latex?f^{-1}(x) = \frac{x-7}{3}" title="f^{-1}(x) = \frac{x-7}{3}" />