Find the Slope of the Line $- x + 8 y = 40$

Multiple Choice

Find the slope of the line.
- $- x + 8 y = 40$

A) $m = - \frac { 1 } { 8 }$
B) $m = \frac { 1 } { 8 }$
C) $m = - 1$
D) $m = 8$