Find the Inverse Mentally $$f ( x ) = 7 x - 8$$

Multiple Choice

Find the inverse mentally.
- $$f ( x ) = 7 x - 8$$

A) $f ^ { - 1 } ( x ) = \frac { 8 - x } { 7 }$
B) $f ^ { - 1 } ( x ) = 8 - \frac { x } { 7 }$
C) $f ^ { - 1 } ( x ) = \frac { x + 8 } { 7 }$
D) $f ^ { - 1 } ( x ) = \frac { x } { 7 } + 8$