阅读下面的诗歌 ，回答相关问题。
                                                                                                                   山 行
                                                                                                          〔清〕 姚 范
                                                                                         百道飞泉喷雨珠，春风窈窕绿蘼芜。
                                                                                         山田水满秧针出，一路斜阳听鹧鸪。
                                                                                      【 注】蘼芜（míwú）：香草名。

如图，已知反比例函数y=$\frac{k}{x}$与一次函数y=x+b的图象在第一象限相交于点A（1，﹣k+4）．

我国封建社会形成于春秋时期。____