SAT Math Practice Question #24081 - SATify | SATify

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SAT Math Practice Question #24081 - SATify | SATify

#24081

algebra

functions

medium

120 sec

If $f (x) = a x + b$ and its inverse is $f^{- 1} (x) = b x - a$ with $a$ and $b$ real, what is the value of $a + b$ ?

A.

-2

B.

-1

C.

0

D.

1

E.

2