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Titik koordinat = (1,7)
x - 2y = 3 → -2y = 3 - x → y = 1/2x - 3/2 → m = 1/2
Ditanyakan : persamaan garis (1,7)
Jawab :
m₁ x m₂ = -1 → m₁ x 1/2 = -1 → m₁ = -2
y - y₁ = m(x - x₁)
y - 7 = -2(x - 1)
y = -2x + 2 + 7
y = -2x + 9 → y + 2x = 9
Jadi, persamaan garisnya adalah y + 2x = 9
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