在近几年各地的中考试题中,常出现含表格条件的一次函数应用题.解这种题的关键是:在了解表格中各量之间关系的基础上,确定一次函数的解析式.现例析如下:例1 声音在空气中传播的速度y(米/秒)(简称音速)是气温x(℃)的一次函数,下表列出了一组不同气温时的音速:(1)求y与x之间的函数关系式;(2)气温x=22℃时,某人看到烟花燃放 In the mid-term examination questions in various places in recent years, a one-function application with table conditions often appears. The key to solving such a problem is: on the basis of understanding the relationship between the quantities in the table, determine the analytic function of the first function. Examples are as follows: Example 1 The speed at which sound travels in the air, y (m/s) (referred to as speed of sound), is a function of the air temperature x (°C). The following table lists the sound speeds for a group of different temperatures: (1) A functional relationship between y and x; (2) At a temperature of x=22°C, someone sees fireworks