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一、选择题(每小题有且只有一个正确答案) (1)若直线3x+4y-21=0与直线2x+3y-15=0,及直线x-2y+3=0均过同一点,则k的值是( )。 A.1; B.2; C. 3; D.5。
1. Multiple-choice questions (there are only one correct answer for each question) (1) If the straight line 3x+4y-21=0 and the straight line 2x+3y-15=0, and the straight line x-2y+3=0 both pass the same point , then the value of k is (). A.1; B.2; C.3; D.5.