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(3,5)--------> x2=3 y2=5
m= y2 - y1/x2-x1 =5-1/3-2 =4/1
B. (4,2) = x1=4 y1=2
(2,7)=x2=2 y2=7
m=y2-y1/x2-x1 = 7-2/2-4 =5/-2
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