Determine the values of constants involved in the definition so that the function is continuous: f(x)=5ax+b21, if x≤2, if 2<x<10, if x≥10

Determine the values of constants involved in the definition so that the function is continuous: $f (x) = \{\begin{matrix} 5 \\ a x + b \\ 21 \end{matrix} \begin{matrix} , i f x \leq 2 \\ , i f 2 < x < 10 \\ , i f x \geq 10 \end{matrix}$

Match the items on the right to the items on the left.