The question is that of Line WX and YZ are parallel or perpendicular, not WZ and XY unlike the other given answer.
THE ANSWER IS NEITHER
See moc up i made. The two lines don't even intersect, I.E the answer is neither!
You have not mentioned the joining points so I have joined the points WZ and XY and plotted in the graph. It seems that the lines WZ and XY are perpendicular.