Unknowns in a combination of vectors

It is given that \(\mathbf{p}=\begin{pmatrix}x\\ 2x\end{pmatrix}\), \(\mathbf{q}=\begin{pmatrix}3\\ y\end{pmatrix}\) and \(3\mathbf{p}-\mathbf{q}=\begin{pmatrix}9\\ 17\end{pmatrix}\).

1. Find the value of \(x\) and the value of \(y\).[2]
2. Find \(|\mathbf{p}|\), leaving your answer in surd form.[2]