Let \(f(x) = \begin{cases} 3x^2 + 2&\text{if } x\le 3, \\ ax - 1 &\text{if } x>3. \end{cases} \)Find \(a\) if the graph of \(y=f(x)\) is continuous (which means the graph can be drawn without lifting your pencil from the paper).
The answer is a = -2.
