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m = y2 - y1 per x2 - x1
= -1 - 2 per 1 - 0
= -3 per 1
(1,1) dan (-3,0)
m= y2 - y1 per x2 - x1
= 0 - 1 per -3 - 1
= -1 per -4
(y2-y1)/(x2-x1) = (0-1)/(-3-1) = -1/-4 = 1/4