点是一次函数图像上两点,则与的大小关系是(    )A.      

是一次函数图像上两点,则的大小关系是(    )

A.         B.        C.         D.不能确定

 

答案

C

解析:∵一次函数y=kx+1(k<0),

∴此函数中y随x的增大而减小,

∵1>-2,

∴a<b.

故选C.

 

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