Question

已知=(3,4),A(-2,-1),则B点的坐标是(    )

A.(5,5)             B.(-5,-5)              C.(1,3)             D.(-5,5)

Answer 1

解析：设B(x,y), =(x,y)-(-2,-1)=(x+2,y+1),

即(x+2,y+1)=(3,4),

∴∴

∴B点的坐标为(1,3).

答案：C