Problem
Express the function graphed on the axes below as a piecewise function. \[ f(x)=\left\{\begin{array}{ll} \square & \text { for } \square \\ \square & \text { for } \end{array}\right. \]
Solution
Step 1 ：\( f(x) = ax + b \) for \( x \leq a \)
Step 2 ：\( f(x) = cx \) for \( x > a \)
