Find the Slope of the Line Containing the Pair of Points

Multiple Choice

Find the slope of the line containing the pair of points.
- $( 1 , - 3 )$ and $\left( \frac { 1 } { 3 } , - 5 \right)$

A) 3
B) $- \frac { 1 } { 3 }$
C) 12
D) $\frac { 1 } { 3 }$