问答题In the xy plane, is the point (4, -2) on the line l?  (1) Point (1, 1) is on line l.  (2) The equation x=2-y describes line l.

题目
问答题
In the xy plane, is the point (4, -2) on the line l?  (1) Point (1, 1) is on line l.  (2) The equation x=2-y describes line l.

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参考答案和解析
正确答案: B
解析:
条件1只提供一个点,不能确定直线l;条件2给出直线方程,可以判断点(4,-2)是否在直线上,故本题选B项。