Find the Slopes of the Lines That Are (A) Parallel $( 3 , - 4 )$

Multiple Choice

Find the slopes of the lines that are (a) parallel to and (b) perpendicular to the line passing through the pair of points.
- $( 3 , - 4 )$ and $( 5,10 )$

A) (a) 7; (b) $- 7$
B) (a) $7 ; ($ b $) - \frac { 1 } { 7 }$
C) (a) $\frac { 1 } { 7 }$ ;
(b) $- 7$
D) (a) $- 7 ;$ (b) $\frac { 1 } { 7 }$