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y-y1 = x-x1
y2-y1 x2-x1
y-1 = x-2
-7-1 -2-2
y-1 = x-2
-8 -4
-4(y-1)=-8(x-2)
-4y+4=-8x+16 (dibagi 4)
-y+1=-2x+4
-y=-2x+4-1
-y=-2x+3
2x-y-3=0