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titik (-3,2)
titik (5,-3) dan (1,-1)
Ditanyakan : persamaan garis melalui titik (-3,2)
Jawab :
m =
m =
m = → m =
karena tegak lurus jadi
m₁ x m₂ = -1 → m₁ x -1/2 = -1 → m₁ = 2
Persamaannya
y - y₁ = m (x - x₁) → y - 2 = 2 (x - (-3))
y = 2x + 6 + 2
y = 2x + 8
Jadi, persamaan garisnya adalah y = 2x + 8
# Maaf kalau salah