For the Given Functions F and G, Find the Requested $$f ( x ) = 9 x - 5 ; g ( x ) = 4 x - 8$$

For the given functions f and g, find the requested function and state its domain.
- $$f ( x ) = 9 x - 5 ; g ( x ) = 4 x - 8$$
Find $\mathrm { f } - \mathrm { g }$ .

A) $( f - g ) ( x ) = 13 x - 13 ; \{ x \mid x \neq 1 \}$
B) $( f - g ) ( x ) = 5 x - 13 ; \left\{ x \mid x \neq \frac { 13 } { 5 } \right\}$
C) $( f - g ) ( x ) = 5 x + 3 ;$ all real numbers
D) $( f - g ) ( x ) = - 5 x - 3 ;$ all real numbers