Boyles law states that :

The pressure of a gas varies directly with temperature at constant volume i.e. $$P \propto T$$.

The product of pressure and volume of a given mass of a gas is constant at constant temperature i.e. PV= constant.

 The volume of a gas varies directly with temperature at constant pressure i.e. $$V \propto T$$.

The pressure of a gas varies directly with volume at constant temperature i.e. $$P \propto V$$.