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Xb-1=-3
Yb-(-4)=-1
Xb=-2
Yb=-5
B(-2,-5)
AB=(-3;-1)
B(x;y)=?
AB=[Xb-Xa;Yb-Ya]
-3=Xb-1
-1=Yb-(-4)
Xb=-3+1
Yb=-1-4
Xb=-2
Yb=-5
B=(-2;-5)