∵ 函数 y = k x + b 当 x = 2 时,y = 5 ,当 x = - 3 时 y = - 5 ∴ 2 k + b = 5 ①- 3 k + b = - 5 ②① - ② 得：5 k = 10k = 2代入①得：2 × 2 + b = 5 b = 5 - 4b = 1∴ k = 2 ,b = 1∴ 函数解析式为：y = 2 x ...