题目

根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。 There were a family of nine: the father, the mother, two boys and five girls. The father worked as a kitchen cleaner at a local school and the rest of the family did the same job-----clean people’s yards.   71       Then one day, the father lost his job at the school. He asked me if I could allow him to clean my yard.    72     He and his family came to our house three times a week to clean the yard. One Sunday morning, the father suffered a stroke 直线l通过两直线7x+5y=24和x-y=0的交点，且点(5，1)到l的距离，则l的方程是________．(写出一般式)