点M(4,m)关于点N(n,-3)的对称点为P(6,-9),则(  ) A.m=-3,n=10 B.m=3,n=10 C.m=-3,n=5 D.m=3,n=5

问题描述:

点M(4,m)关于点N(n,-3)的对称点为P(6,-9),则(  )
A. m=-3,n=10
B. m=3,n=10
C. m=-3,n=5
D. m=3,n=5

∵M(4,m)关于点N(n,-3)的对称点为P(6,-9)

4+6
2
=n,
m−9
2
=-3;
∴n=5,m=3,
故选:D.