Question

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Answer 1

slop b/w the set1 points is:
(9 - 5)/(2 - 1) = 4/1 = 4
and slope b/w the set2 points is:
(4 - 2)/(3 - 6) = 2/-3 = -2/3
so,
B is the answer

Answer 2

did this helped you or should i explain more ?

Answer 3

btw slope = m = (y2-y1)/(x2-x1)