x-axis
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On a standard Cartesian graph, there are two axes. The Y axis runs vertically, bottom to top and the X axis runs horizontally from left to right.
The 'Y' axis.
typically the y-axis. sometimes it changes when it fits the graph better, but always put the y-axis as the vertical one unless told to otherwise. when you get to 3-D drawins the y-axis is usually the vertical one but sometimes it changes.
horizontal
Left to right