Find the Slope of the Line $x + 3 y = 1$

Multiple Choice

Find the slope of the line.
- $x + 3 y = 1$

A) $m = - 3$
B) $m = \frac { 1 } { 3 }$
C) $m = - \frac { 1 } { 3 }$
D) $m = 1$