Find the Slope of the Line Passing Through the Pair $( - 5,1 ) , ( - 5 , - 4 )$

Multiple Choice

Find the slope of the line passing through the pair of points. $( - 5,1 ) , ( - 5 , - 4 )$

A) $m = 8$
B) $m = 6$
C) $m = 0$
D) $m = 5$
E) undefined