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Persamaan garis lurus melalui dua buah titik gunakan rumus y-y₁/y₂-y₁ = x-x₁/x₂-x₁
y₁ = -2, y₂ = 1
x₁ = 3, x₂ = 4
y-y₁ / y₂-y₁ = x-x₁ / x₂-x₁
y-(-2) / 1-(-2) = x-3 / 4-3
y+2 / 3 = x-3 /1
y+2 = 3 (x-3)
y+2 = 3x - 9
y-3x+2+9 = 0
y-3x+11 = 0 -> untuk bentuk ax+by+c=0
y = 3x-11 -> untuk bentuk y=ax+c
Semoga membantu..