9000090906

Given lines $p$ and $q$, find $m\in \mathbb{R}$ such that the lines $p$ and $q$ are parallel. $$\begin{array}{rlr}p:x& =1+t,& \\ y& =-3t;t\in \mathbb{R},\end{array}\begin{array}{rlr}q:x& =3-2u,& \\ y& =1+mu;u\in \mathbb{R}\end{array}$$