题目内容
若A(-1,-1),B(1,3),C(x,y)三点共线,则x=________,y=________.
A.A={1,8},B={2,6}
B.A={1,3,5,8},B={2,3,5,6}
C.A={1,8},B={2,3,5,6}
D.A={1,3,8},B={2,5,6}