The combined gas law is an equation that relates the pressure, temperature and volume of a gas. Based on this equation, you can predict what will happen to a sample of gas if you change one of the variables. If you decrease pressure and temperature simultaneously, you will not know the exact result unless you know the exact values by which each quantity decreased.
As the temperature to which gas molecules is exposed to is increased its pressure will also increase because the molecules of gas absorbs the energy it allows the molecules to fast and the faster they move the greater is the pressure that the gas molecules exert