Let F(x) = 5x + 4 $f ^ { - 1 } ( x ) = \frac { x + 5 } { 4 }$

Let f(x) = 5x + 4. Find f ^{- 1} (x) .

A) $f ^ { - 1 } ( x ) = \frac { x + 5 } { 4 }$
B) $f ^ { - 1 } ( x ) = \frac { x - 4 } { 5 }$
C) $f ^ { - 1 } ( x ) = \frac { x + 4 } { 8 }$
D) $f ^ { - 1 } ( x ) = \frac { x } { 5 } - 4$
E) $f ^ { - 1 } ( x ) = \frac { 1 } { 5 x - 4 }$

Correct Answer:

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