It is the x axis
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I believe you meant the "independent" variable, and it is the X axis. The Y axis (the vertical one) is for the dependent variable.
The 'Y' axis.
The independent variable is along the bottom or horizontal or x axis. The dependent variable is up the left hand side or vertical or y axis
It is a velocity-time graph in which time is plotted along the horizontal axis and the velocity of an object in a selected direction is plotted along the vertical axis.
An answer can be found here: