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the ideal gas equation: pV=nRT.
now if you rearrange the equation, you'll get pv/RT=n. So n will always have a constant value for a fixed mass of gas. Hence the expected graph for pV/RT against p should be a horizontal line.
EXTRA: If you want to plot a graph having the same axes but with a different mass of gas, the graph would be a different horizontal line...nothing much. Think about plotting a graph of mass of gas trapped inside a cylinder as you push in the piston to change the pressure. The mass never changes