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y -y₁ = x -x₁
y₂ -y₁ x₂ -x₁
y -5 = x -(-2)
0 -5 0 -(-2)
y -5 = x +2
-5 2
2(y -5) = -5(x +2)
2y -10 = -5x -10
2y = -5x -10 +10
2y = -5x
5x +2y = 0