有關於PPF - 經濟

題目:https://goo.gl/XZz4T3


Refer to Figure 3-8. If the production possibilities frontiers shown are
each for one day of production, then which of the following combinations of
coffee and soybeans could Chile and Colombia together make in a given day?
A. 4 pounds of coffee and 16 pounds of soybeans
B. 8 pounds of coffee and 15 pounds of soybeans
C. 16 pounds of coffee and 10 pounds of soybeans
D. 24 pounds of coffee and 4 pounds of soybeans


我的想法:
當初是想說，將兩個直線方程式合併後，得到新的方程式
再將選項的數字代入驗證是不是正確的答案，但一直找不
到方法做，問友人也只知道答案用湊的出來是A，好苦惱
求版上的大大為我解答QQ

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