Any variable that you like. If you have one independent variable and one dependent, then by convention, the independent one would go on the x-axis.
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The independent variable goes on the horizontal (x) axis.
The y axis is going up on the graph and the x axis is going sideways on the graph
the y-intercept is the part of a graph that goes through the y-axis (0 on the x-axis).
The horizontal axis of a typical graph would be the "X-axis"
the origin