The variable x.
If there is an independent variable it would be placed on the x axis but there need not be one.
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The independent variable goes on the horizontal (x) axis.
The independent variable is usually plotted on the horizontal or x-axis.
The horizontal axis, or "X" axis, is usually reserved for the variable you have no control over, such as the passing of time. This is called the independent variable.
In a graph the vertical axis displays the y variablewhile the horizontal axis displays the x variable. The manipulated variable will be shown on the x axis while the responding variable will be shown on the y axis.
The independent variable is by convention drawn on the x (horizontal) axis, with the dependent variable on the y (vertical) axis.