Answer:
choice A
Explanation:
According to the graph, we have
W(-2,1)
X(1,4)
Y (4,1)
Slope m = (y2 - y1)/(x2 - x1)
Slope of WX: m(wx) = (4 -1)/(1 - (-2)
Slope of XY: m(xy) = (1-4)/(4-1)
The slopes of two perpendicular lines are negative reciprocals of each other. This means that their product is -1.
(4 -1)/(1 - (-2) x (1-4)/(4-1) = -1
So choice A is the correct answer.