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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.
参考答案
参考解析
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。
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。
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