题目

I still remember the day I was driving to the supermarket I own. When I came out, I found a boy   16   my car with a brush(刷子). I went over and patted (拍) him on the shoulder, which surprised him very much. In no time he began to   17   at me, so I was sure he   18   some money. From the shoes he was wearing I could hardly imagine how 40 he was. So I offered him a $100 bill. To my great surprise, he   19   to take it. When I was wondering what he was doing, he said, “I was waiting here for 4 hours, waiting for you. Your   20   is so beautiful and I like it, 如图，已知函数y=ax+b和y=kx的图象交于点P，则根据图象可得，关于的二元一次方程组的解是________．