Question

平面直角坐标系中,O为坐标原点,已知两点A(3,1),B(-1,3),

Answer 1

OA=(3,1),OB=(-1,3).

OC=a(3,1)+b(-1,3)

=(3a-b,a+3b)

由C(x,y).

x=3a-b,

y=a+3b,

a+b=1

联立,x=4a-1,y=3-2a.

则2x+y-1=0.