independent
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on the horizontal axis!
The independent variable, in this case time, is on the horizontal axis of a speed graph.
The horizontal axis usually is.
Not necessarily. If one of the variables is independent of the other(s) then it is usually placed on the horizontal axis. But that will not be the case if, for example, you want two back-to-back charts.
If you are graphing the results of an experiment, the dependent variable is on the vertical, or y-axis, and the independent variable is on the horizontal axis, or x-axis.