问一个GMATPREP,没有讨论过

cutelee1974

In the XY-plane, what is the Y-intersection of line L?

1. slope of line is 3 times its Y-intersection

2. X-intersection of Line L is  -1/3 

我觉得C正确啊,可是人家答案是E

NN指教

另外有一问题不明白,大家别笑话我.和Y轴垂直的直线,各X轴垂直的直线斜率怎么算啊?

cutelee1974

谢谢大家了.明白这道题了.

那个斜率我查到了OG的解释,Y=b时斜率为零和大家说的一样,可是当直线为X=a时,OG说"for the vertical line, slope is not defined",而不是1