It may be Boyle's law, but there is not enough context in the question to be sure.
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Boyle's Law
PV=k Apex (:
R = PV/T
Boltzman constant
According to the ideal gas law, pressure times volume is constant. We'll call that constant c. PV=C, P=c/V, so pressure is inversely related to volume, so it would look like the graph y=1/x multiplied by a constant.