Find the values of a and b such that the function defined by `f(x)={{:(5, if xle2), (a x+b , if 2 lt x lt10 ),(21 , ifx ge10):}` is a continuous function.

Explanation

To find the values of \( a \) and \( b \) such that the function

\[
f(x) =
\begin{cases}
5 & \text{if } x \leq 2 \\
ax + b & \text{if } 2 < x < 10 \\
21 & \text{if } x \geq 10
...