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Oke, jadi persamaan garis g :
3x + 6y = 18
(Caranya : 3 di sumbu y, 6 di sumbu x, 18nya dari 3 x 6)
Garis g nya tegak lurus :
3x + 6y = 18 -> m1 = -1/2
m1 x m2 = -1
-1/2 x m2 = -1
m2 = 2
Persamaan garis l melalui titik (6,0) :
y - y1 = m (x - x1)
y - 0 = 2 (x - 6)
y = 2x - 12 (B)