# Question #954aa

The ideal gas equation states $p V = n R T$ where p is pressure, V is volume, n is amount of substance (no. of moles), R is gas constant and T is temperature.
If temperature remains constant, then because the amount of substance is constant, and the gas constant is, of course, constant, then it means that $n R T$ is constant ($p V =$ constant is Boyle's law).
So if $p V =$ a constant, it means that a plot of pV against p is a straight line which is parallel to the x axis.