Find the Average Rate of Change of the Function From x

Multiple Choice

Find the average rate of change of the function from $$x _ { 1 } \text { to } x _ { 2 }$$
- $f ( x ) = 5 x + 7$ from $x _ { 1 } = - 1$ to $x _ { 2 } = 0$

A) 5
B) $- 28$
C) $\frac { 1 } { 2 }$
D) $- \frac { 1 } { 6 }$