Maths--Coordinates

圖片參考：http://photo.share-moment.com/diary/user_Folder/65111/080246183717055.jpg

從圖可看到, 無論P在x-axis那一點
P的y-coordinate都一定是0
SO, If P is a point on the x-axis, then the y-coordinate of P is 0.

0,,,我本maths書有講~

If P is a point on the x-axis, then the y-coordinate of P is __0__.

2008-06-17 23:07:51 補充：
(-3, 0), (-2, 0), (-1, 0) (0, 0), (1, 0), (2, 0), (3,0), ........

All of the above are points on the x-axis. The y-coordinate of all these points are 0.