如图，两条公路OA和OB相交于O点，在∠AOB的内部有工厂C和D，现要修建一个货站P，使货站P到两条公路OA、OB的距离相等，且到两工厂C、D的距离相等，用尺规作出货站P的位置．（要求：不写作法，保留作图痕迹，写出结论）

根据短文填表。

    Mrs. Wilson is not tall with curly hair. She comes from Australia. She is our math teacher. But I don't like maths. It's too difficult and boring. Mrs. Wilson is 25 years old. She is very shy and kind of serious. She never plays games with us. She often sees the films on weekends. And she enjoy reading very much. She has lots of books in her bedroom.

甲、乙两种商品原来的单价和为100元，因市场变化，甲商品降价10%，乙商品提价40%，调价后两种商品的单价和比原来的单价和提高了20%、若设甲、乙两种商品原来的单价分别为x元、y元，则下列方程组正确的是（   ）