please do it in 10 minutes will upvote

The following table presents the amounts that can be produced per year for two countries in the production of cars and shoes. Usi b. Graph the Production Possibilities Frontier (PPF) for each country (put shoes on the y axis and cars on the x axis). Calculate the slope of the PPF and relate your findings to the answers in part a. Explain why the PPF has a constant slope. [5 marks]