exam Maths Puzzle Numerical Ability

Hi. Can I have some help with the following problem?

Boyle's Law states that the pressure P of a sample of gas is directly proportional to the temperature T and inversely propor

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-3x+y=-2 Thank you for the help. I actually had one of the problems right. I still have a couple left and it helps that I can see how to do the problems and see what to do right, and what I