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m1 pada 2x+3y = 6 adalah :
2x+3y = 6
3y = 6-2x
y = 2-2/3x
y = -2/3x+2
m1 = -2/3
-2/3.m2 = -1
m2 = 3/2
y-y1 = m(x-x1)
y-3 = 3/2(x+2)
y-3 = 3/2x+3
y = 3/2x+6
atau 3x-2y+12 = 0/B