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If the point's ordinate, or y-coordinate, is zero then it must lie on the x-axis somewhere.
Because the x axis is horizontal and the y axis is vertical and they both are perpendicular to each other at the point of origin (0, 0)
If a point lies on the x-axis then by definition it is located at (x,0) ie the y coordinate is 0.If a point lies on the y-axis then it's located at (0,y) ie the x coordinate is 0.
For a point (x,y), y is the ordinate. So let's suppose you have a point (3,4) The 3 will be three spaces to the right of (0,0) on the x axis. And the y will be four spaces above that. In this example, the ordinate is 4.
The y axis is the vertical axis and a y coordinate is the 'ordinate' The x axis is the horizontal and a x coordinate is the 'abscissa'