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Menentukan gradien garis (m1) terlebih dahulu
2x - 3y + 5 = 0
3y = 2x + 5
y = 2/3 x + 5/3
m1 = 2/3syarat suatu garis tegak lurus yaitu m1 . m2 = -1
m1 . m2 = -1
2/3 . m2 = -1
m2 = -3/2persamaan garis melalui titik (2,5) dan gradien m2 = -3/2
y - y1 = m2(x - x1)
y - 5 = -3/2(x - 2)
2y - 10 = -3(x - 2)
2y - 10 = -3x + 6
3x + 2y - 16 = 0Jadi persamaan garis yang melalui titik (2,3) dan tegak lurus garis 2x - 3y + 5 = 0 adalah 3x + 2y - 16 = 0.
pers. II = 5x + 2y = 10