多选题Which of the following equations are for lines which are perpendicular to the line y=2x+4?A2y +x = 5B2y –x = 3Cx + 2y = 7Dx – 2y = 4E4y +2x = 0
题目
多选题
Which of the following equations are for lines which are perpendicular to the line y=2x+4?
A
2y +x = 5
B
2y –x = 3
C
x + 2y = 7
D
x – 2y = 4
E
4y +2x = 0
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参考答案和解析
正确答案：
C,B
解析：
直线y=2x+4的斜率为2，所以与其垂直的直线的斜率为-1/2，故本题选择ACE三项。
直线y=2x+4的斜率为2，所以与其垂直的直线的斜率为-1/2，故本题选择ACE三项。