Find the Slope of the Line Connecting the Points $$\left( - \frac { b } { 2 } , a \right) , \left( 3 b , \frac { a } { 2 } \right)$$

Multiple Choice

Find the slope of the line connecting the points. Simplify to eliminate fractions from the numerators and denominators. $$\left( - \frac { b } { 2 } , a \right) , \left( 3 b , \frac { a } { 2 } \right)$$

A) $- \frac { a } { 7 b }$
B) $- \frac { 7 a } { b }$
C) $- \frac { a } { 13 b }$
D) $- \frac { 13 a } { b }$
E) $- \frac { a } { 3 b }$