# Which value goes on which axis in “plot $a$ against $b$”?

When the question asks to plot $a$ against $b$, which value should go on which axis?

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One of them goes on each axis. Instruct the reader to turn the paper 90° if he would like it the opposite way around. –  Henning Makholm Sep 7 '12 at 14:33
@Henning ... the reader may also need a mirror. :-) –  Willie Wong Sep 7 '12 at 14:54

Plot $y$ versus $x$
means that $y$ is considered as a dependent variable, and $x$ as an independent variable. So $y$ goes on the vertical axis.