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a.(3,5) dan (5,9)
m = 5-9 / 3-5
= -4/-2
= 2
b.(-2,1) dan (2,4)
m = 1-4 / -2-2
m = -3/-4
m =3/4
c.(3,4) dan (7,-3)
m = 4-(-3) / 3-4
m = 7/-4