Depends on the sort of graph. Time is common is be on the x axis. Frequency may be fro a Power Spectrum Density Function.
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The independent variable is usually plotted on the horizontal or x-axis.
The horizontal axis of a typical graph would be the "X-axis"
x axis
The graph is called a corrdinate plane. The horizontal is called the x-axis. The verticle is the y-axis.
The independent variable goes on the horizontal (x) axis.