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m =
syarat tegak lurus m1.m2 = -1
. m2 = -1
m2 =
persamaan garis melalui titk (-4, -1)
y - y1 = m(x - x1)
y + 1 = (x + 4)
y + 1 = - 6
2y + 2 = -3x - 12
2y + 3x + 14 = 0