单选题过点（1，2）且与直线2x＋y－3＝0平行的直线方程为（ ）．A2x＋y－5＝0B2y－x－3＝0C2x＋y－4＝0D2x－y＝0
单选题
过点（1，2）且与直线2x＋y－3＝0平行的直线方程为（ ）．
A
2x＋y－5＝0
B
2y－x－3＝0
C
2x＋y－4＝0
D
2x－y＝0
参考解析
解析：
设和2x＋y－3＝0平行的直线方程为2x＋y＋c＝0，将（1，2）代人，则有2×1＋2＋c＝0，得c＝－4．
设和2x＋y－3＝0平行的直线方程为2x＋y＋c＝0，将（1，2）代人，则有2×1＋2＋c＝0，得c＝－4．
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