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y - y₁ x - x₁
-------- = ---------
y₂- y₁ x₂ - x₁
y - 2 x - 0
-------- = ----------
0 - 2 1 1/2 - 0
y - 2 x
-------- = --------
-2 1 1/2
y - 2 x
-------- = -----
- 2 3/2
3/2 (y - 2) = -2 x
--------------------------- x 2
3 (y - 2 ) = - 4 x
3y - 6 = - 4x
3y + 4x - 6 = 0