一次函数是初中数学的重要内容之一,在处理实际问题时有着广泛的应用.翻阅今年的各地中考试卷,有关一次函数的题目层出不穷,现采撷两例与同学们分享.例1(2010年浙江绍兴)在平面直角坐标系中,一次函数的图象与坐标轴围成的三角形,叫做此一次函数的坐标三角形.例如,图1中的 First-order function is an important part of junior high school mathematics, which has a wide range of applications in dealing with practical problems .Through this year's examination papers around the area, an issue of a function of an endless stream, now pick two cases to share with the students.Example 1 Shaoxing) In plane Cartesian coordinates, the triangle formed by the image of the first-order function and the coordinate axis is called the coordinate triangle of this first-order function. For example,