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y₂ -y₁ x₂ -x₁
y -5 = x -2
2 -5 -1 -2
y -5 = x -2
-3 -3
-3(y -5) = -3(x -2)
-3y +15 = -3x +6
-3y = -3x +6 -15
-3y = -3x -9
3x -3y +9 = 0