For the Function, Find the Average Rate of Change of F

For the function, find the average rate of change of f from 1 to x: $$\frac { f ( x ) - f ( 1 ) } { x - 1 } , x \neq 1$$
- $$f ( x ) = 8 x$$

A) $\frac { 8 } { x - 1 }$
B) 0
C) 7
D) 8