One to One help

Question

For the following if the function is one to one, find the formula for the inverse and show all work.

 

a) f(x)=7-x

 

b) f(x)= 5x+8

 

Answer 1

a) f( x) = 7 - x 

 

 

        Y = 7 -x 

 

      X = -Y +7

 

     f^-1 ( x) = -X +7 

 

  Can follow the same steps and find b).