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2x - 3y = 5
3y = 2x - 5
y = 2/3x - 5
m₁ = 2/3
m₁ x m₂ = -1
m₂ = -3/2
Persamaan garis baru :
y - y₁ = m(x - x₁)
y - 2 = -3/2 (x + 1)
y - 2 = -3/2x - 3/2
2y - 4 = -3x - 3
2y = -3x + 1
Jadi, persamaan garis yang melalui titik A (-1,2) dan tegak lurus garis 2x - 3y = 5 adalah 2y = -3x + 1