If there is an independent variable, then that should go on the x axis. This is the variable that influences whatever you are measuring but is not influenced by it - for example time.
If the variables affect each other then the one you have more control over. The one that you change and then measure the other.
But these methods do not always work. If your experiment is to plot the readings from Celsius and Fahrenheit thermometers in a beaker that is heated, either of the C value or F value can go on the x axis.
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