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Karena Tegak lurus berarti gradiennya
(2,-5)
x1 = 2
y1 = -5
y-y1 = m (x-x1)
y+5 = (x-2)
y = + - 5
-----------------------------------------------------------------------------x3
3y = -x + 2 - 15
3y = -x - 13
Bisa kayak gini :
1. 3y = -x -13
2. 3y + x + 13 = 0
3. 3y + x = -13
Tergantung options
1x - 3y = 1 (2) - (-3) (-5)
1x - 3y = 2- (-15)
1x - 3y = 2 + 15
1x - 3y = 17
x - 3y = 17
itu jawabannya...ada pilihannya ga?