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m1 = -1 - (-2) per 6 - 4 = 1/2
karena tegak lurus, maka:
m2 = -1 : 1/2 = -2
persamaan garis l
y - (-3) = -2 (x - 4)
y + 3 = -2x + 8
y + 2x - 5 = 0