Inverse and Direct Variation Word Problems - Examples

For years chemists tried to create an equation to describe the relationship between a gas molecule and its environment. Eventually they came up with the Ideal Gas Law. This law states that pressure $P$ varies jointly with temperature $T$ and the number of moles of gas $n$, and inversely with volume $V$. The constant of variation in the ideal gas law is known as $R$.

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Given the above information, choose the Ideal Gas Law.