If f(x)=a x+b and f^{-1}(x)=b x+a with a and b real, what is the value of a+b ?
Answer Choices
A. -2
B. -1
C. 0
D. 1
E. 2
If f(x)=a x+b and f^{-1}(x)=b x+a with a and b real, what is the value of a+b ?
Answer Choices
A. -2
B. -1
C. 0
D. 1
E. 2