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mab = (y2-y1) / (x2-x1)
mab = ( 1+2) / (-1 -5)
mab = 3/-6
mab = - 1/2
mab = m2 = - 1/2
persamaan haris melalui m = -1/2 dan melalui titik (-5,2)
y - y1 = m (x - x1)
y - 2= -1/2 ( x + 5).
kalikan dengan 2 agar pecajannya ga ada
2y - 4 = -1 ( x + 5)
2y - 4 = -x- 5
2y - x = - 5 + 4
2y - x = -1