Find the Inverse of the Function $$f ( x ) = \frac { 8 x + 1 } { - 5 x - 4 }$$

Multiple Choice

Find the inverse of the function.
- $$f ( x ) = \frac { 8 x + 1 } { - 5 x - 4 }$$

A) $\mathrm { f } ^ { - 1 } ( \mathrm { x } ) = \frac { - 5 \mathrm { x } - 8 } { 4 \mathrm { x } + 1 }$
B) $f ^ { 1 } ( x ) = \frac { 4 x + 1 } { - 5 x - 8 }$
C) Not a one-to-one function
D) $f ^ { - 1 } ( x ) = \frac { 8 x + 1 } { - 5 x - 4 }$