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------- = -------
y2-y1 x2-x1
y-(-1) x-2
-------- = --------
4-(-1) 3-2
y+1 x-2
------- = --------
5 1
1 (y+1) = 5(x-2)
y+1 = 5x-10
y = 5x -11 atau
-5x+y+11=0