Line wx contains (−1, 2) and (4, 12) line yz contains points (5, 8) and (−2, −6). lines wx and yz are

We have to find the slope of these lines using the slope formula 
slope = (y2 - y1) / (x2 - x1) 

Line WX : 
(-1,2) x1 = -1 and y1 = 2 
(4,12) x2 = 4 and y2 = 12 
now sub into the slope formula 
slope = (12 - 2) / (4 - (-1) 
slope = 10/(4 + 1) 
slope = 10/5 which reduces to 1/2 
so the slope of line WX = 1/2 

Line YZ : 
(5,8) x1 = 5 and y1 = 8 
(-2,-6) x2 = -2 and y2 = -6 
now we sub into slope formula 
slope = (-6-8) / (-2-5) 
slope = -14/-7 
slope = 1/2 
so the slope in line YZ = 1/2 

Line WX and line YZ are : (D) parallel because the slopes are the same.

The answer would be a