Question

Dados os pontos A = (-1, 2,-3), B = (3,-1,-2) e C = (-2,4,0), determinar o ponto D de modo
que CD=1/2 AB

Answer 1

Calculo AB
AB = B-A = (3,-1)-(-1,2) = (4,-3) 

Calculo CD
CD = 1/2 AB = (2,-3/2) = D-C = (x,y)-(-2,4) = (x+2,y-4) substituir valor aqui


x+2 = 2 ->              x = 0 


y-4 = -3/2 ->         y = 5/2