Help with heat engines

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tobedomd

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So I'm taking a practice test and I need some help with a heat engine problem.
There are three parts, the one that's giving me trouble is a-->b. The Volume v. Pressure graph shows a straight line with negative slope. Pa= 5 atm Va= 5 L Ta=300K and Tb=800K are given.
So pressure is decreaseing, while volume and temperature are increasing. What type of process is this? How could I find Pb or Vb?
 
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