Find the Slope (If Possible)of the Line Passing Through the Points

Multiple Choice

Find the slope (if possible) of the line passing through the points $\left( \frac { 4 } { 5 } , - \frac { 7 } { 8 } \right)$ and $\left( - \frac { 5 } { 3 } , - 6 \right)$ .

A) $\frac { 296 } { 615 }$
B) $\frac { 615 } { 296 }$
C) - $\frac { 615 } { 296 }$
D) - $\frac { 296 } { 615 }$
E) not possible