In a gas, which quantities relate in such a way that when one increases, the other one decreases?

Boyle's law states that the volume of a given mass of gas varies inversely with the pressure when the temperature is kept constant. An inverse relationship is described in this way. As one variable increases in value, the other variable decreases

where is the rest of the question. this isn't making sense. can you upload a picture of the question?

answer; code of federal regulations;