Question

dados os pontos A(-1,3), B(1,0), C(2,-1), determinar D tal que DC = BA. Me ajudem (:

Answer 1

D = (x, y)

 

DC=BA

(x-2,y-(-1))=1(1-(-1),0-3)

(x-2,y+1)=(1+1,-3)

 

x-2=2

x=4

 

y+1=-3

y=-4