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Pressure and temperature are the variables in Gay-Lussac's law.

The law states that a pressure of a gas is directly proportional to the gas' temperature if the mass and volume are fixed. This means that there are only two variables, as the other two values are fixed: only pressure and temperature can change according to this law.

Answer:

pressure and temp.

Explanation:

temperature (T1), the initial pressure (P1), the final temperature (T2) and the final pressure (P2)