题目

       The cars were honking （鸣叫） on the road one morning as I was walking to the park．I walked on and soon found the cause — a little taxi that had got stuck in the middle of the road．There was sweat on the driver's face as he tried to start the engine again and again — nothing happened．No petrol,        I said to myself and then found myself getting angry．Why doesn't the fool move his taxi to the side? I thought, so did all the others who honked and shouted．        He got up tiredly, and the passenger in the taxi got out．He was a young man反比例函数y1=kx的图象与一次函数y2=mx+b的图象交于A（1，3），B（n，-1）两点．（1）求反比例函数与一次函数的解析式；（2）根据图象回答：当x取何值时，y1＞y2．