Question 387783
Easiest way is to draw them out.
Now look at the slope of the two lines. 
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{{{drawing(300,300,-2,8,-2,8,grid(1),
circle(4,3,0.1),
circle(7,-1,0.1),
circle(5,5,0.1),
circle(7,3,0.1),
locate(4.3,3.5,W),
locate(7.3,-1,X),
locate(5.3,5.5,Y),
locate(7.3,3,Z),
blue(line(4,3,7,-1)),
blue(line(5,5,7,3)),graph(300,300,-2,8,-2,8,0))}}}