Find the Slope of the Line Satisfying the Given Conditions $( 7 , - 9 )$

Multiple Choice

Find the slope of the line satisfying the given conditions.
-through $( 7 , - 9 )$ and $( - 7,9 )$

A) $\frac { 9 } { 7 }$
B) $- \frac { 7 } { 9 }$
C) $\frac { 7 } { 9 }$
D) $- \frac { 9 } { 7 }$