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On a graph, the horizontal axis is known as the x axis, and in a set of two-dimensional co-ordinates, it is the co-ordinate which is plotted first.The vertical axis is known as the y axis, and in a set of two-dimensional co-ordinates, it is the co-ordinate which is plotted second.
the ordinate
Ordinate
A six figure grid co-ordinate system is the standard method for maps. This system is used in the Global Positioning System.
The abscissa is the x or horizontal coordinate. The ordinate is the y or vertical coordinate. I remember them because they are both alphabetical.