Find the Slope of the Line Determined by This Pair $- \frac { 4 } { 3 }$

Multiple Choice

Find the slope of the line determined by this pair of points. (9, 9) , (12, 5)

A) $- \frac { 4 } { 3 }$
B) $- \frac { 3 } { 4 }$
C) $\frac { 4 } { 3 }$
D) $\frac { 3 } { 4 }$
E) $- 4$