2010005001

Determine whether two lines $a$ and $b$ are identical, parallel, intersecting or skew. $$\begin{array}{rlrl}a:x& =3-2m,& & \\ y& =4-3m,& & \\ z& =4+m;m\in \mathbb{R}& & \end{array}$$ $$\begin{array}{rlrl}b:x& =-n,& & \\ y& =-5,& & \\ z& =4-3n;n\in \mathbb{R}& & \end{array}$$