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Maka yang tegak lurus dengan 3 adalah -1/3
Karena 3 x -1/3 = -1
Maka,
(y-y1) = m (x-x1)
(y-1) = -1/3 (x-2)
y-1 = -1/3x + 2/3
y = -1/3x + 5/3