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m₁ = -a/b
= -2/3
m₂ = -1 : -2/3
= -1 × 3/-2
= 3/2
persamaan garis yg melalui titik P (-2,6)
y - y₁ = m (x - x₁)
y - 6 = 3/2 (x + 2)
y - 6 = 3/2 x + 3 (semua dikali 2)
2y - 12 = 3x + 6
2y - 3x - 12 - 6 = 0
2y - 3y - 18 = 0