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a. (x1,y1)=(2,3)
(x2,y2)=(6,8)
m=(y2-y1)/(x2-x1) = (8-3)/(6-2)=5/4
b.(x1,y1)=(-4,5)
(x2,y2)=(-1,3)
m=(y2-y1)/(x2-x1) = (3-5)/(-1-(-4))=-2/3