阅读下面的文字后，解答问题：

有这样一道题目：已知，一次函数y=kx+b的图象经过A（0，a），B（-1，2），______，则△ABO的面积为2，试说明理由、题目中横线部分是一段被墨水污染了的无法辨认的文字，

（1）根据现有信息，你能否求出题目中一次函数的解析式？若能，请写出适合条件的一次函数解析式？

（2）请根据你的理解，在横线上添加适当的条件，把原题补充完整．

Which of the following statements can be inferred from the graph ？（）
Ⅰ．School X has a smaller enrollment than School Y.
Ⅱ．If the age of a book is the number of years since purchase, then the average (arithmetic mean) age of a book in the School Y inventory is less than that of a book in the School X inventory.
Ⅲ．According to the inventory, School X and School Y purchased the same number of textbooks in 1976.

A．None

B．Ⅰ only

C．Ⅱ only

D．Ⅰ and Ⅱ

E．Ⅱand Ⅲ