已知a〔2,3〕b〔4,-3〕且向量ap=-2向量pb则p点坐标的解题步骤

问题描述:

已知a〔2,3〕b〔4,-3〕且向量ap=-2向量pb则p点坐标的解题步骤

ap=-2pb
ap+2pb=0
ap+pb+pb=ab+pb=0
ab=(2,-6)
p(x,y)
pb=(4-x,-3-y)
2+4-x=0
-6-3-y=0
x=6
y=-9
p(6,-9)