Question 333148
Y=mX+b
(4,2) and (-4,4). 
m=(Y2-Y1)/(X2-X1)
m=(4-2)/(-4-4)
m=2/-8
m=-1/4 ans. for this slope.
(-8,1) and (8,-3). 
m=(-3-1)/(8+8)=-4/16=-1/4 ans. for this slope.
These lines are parallel because the slopes are equal.