一次函数是中考的重要考试内容之一,有关的各类题型值得大家密切关注.现选析2012年中考中一些问题情境或解答途径独特的考题,与大家分享.一、析形状选关系式例1(哈尔滨)李大爷要围成一个长方形菜园.菜园的一边利用一面足够长的墙,用篱笆围成的另外三边的总长恰好为24米.要围成的菜园是如图1所示的长方形ABCD.设BC边的长为x米,AB边的长为y米,则y与x之间的函数关系式 A function is one of the important examinations in the exam, the various types of questions worth close attention to are now selected in 2012 some of the questions in the examination environment or answer a unique way to share with you. Example 1 (Harbin) Uncle Li wants to form a rectangular vegetable garden with one long side of the wall, and the other three sides of the fence surrounded by hedges are exactly 24 meters in length. Of the rectangle ABCD. Let BC side of the length of x meters, AB side length of y meters, then the relationship between y and x