Find the slope of each line.
The slope is found by the change in Y over the change in X
For line AB
Slope = (11-(-4) / (2-(-1)
= 15/3 = 5/1
= 5
For line CD
Slope = (10-1) / (4-1)
= 9/3
= 3
Because the slopes are not the same, the lines are not parallel.
The slopes are not reciprocal of each other so are not perpendicular either.
The answer would be neither.
