How do I find the inverse of a given function and check it by using 3 points? The function is f(x)= 4x+3

Question

anonymous · Answer

So far I have as the inverse (x-3)/4 I'm just not sure how to check it with the 3 points Please tell me if I am correct.

anonymous · Answer

anonymous · Answer

this should help

anonymous · Answer

you are right

anonymous · Answer

Thanks, Now do I just pick any #'s for X & Y?

anonymous · Answer

$$f(x)=4x+3\
f^{-1}(x)=\frac{x-3}{4}$$

anonymous · Answer

i think what they want you to do is this 
say for example $$f(2)=4\times 2+3=11$$ and $$f^{-1}(11)=\frac{11-3}{4}=2$$

anonymous · Answer

so since $$f)(2)=11,f^{-1}(11)=2$$ then it is a good indication it is right 
repeats with 2 other numbers

anonymous · Answer

That's what I was thinking, I could use different #'s for each and just switch my input (x) for my output (y) for the inverse

anonymous · Answer

Thanks (: