The production possibilities frontier (PPF) is curved because the cost of production is not constant. If every trade-off were the same, it would create a straight line. But the direction that PPF is curved comes from the way that the trade-offs change
We can plug in the values of this point to find b -4 = 17 (3) +b We will multiply 17 times 3 -4 = 51 + b We then subtract by 51 on both sides -55 = b So the full equation will be y = 17x - 55
