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y - y1 = x - x1
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y2-y1=x2-x1
y-(-3) =x-(-2)
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-2-(-3)=-1-(-2)
y+3 =x+2
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-2+3=-1+2
y+3=x+2
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1 = 1
1(y+3)=1(x+2)
1y+3=1x+2
y=x+2-3
y=x-1