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Jest to pozioma prosta y=-2
x₂ = 3
y₁ = - 2
y₂ = - 2
(x₂ - x₁)(y - y₁) = (y₂ - y₁)(x - x₁)
(3 - 1)(y + 2) = (- 2 + 2)(x - 1)
2(y + 2) = 0(x - 1)
2y + 4 = 0
2y = - 4
y = - 4/2 = - 2
y = - 2 równanie prostej