jmc

We find the slope for each line. The slopes are $\frac{3}{1}=3$, $\frac{4}{2}=2$, $\frac{9}{3}=3$, $\frac{1}{2}$, and $\frac{1}{4}$. Parallel lines have the same slope, therefore lines $a$ and $c$ are parallel. Perpendicular lines have slopes that are negative reciprocals. None of the slopes above are negative reciprocals, therefore there are no perpendicular lines. There are $1+0=\boxed{1}$ pairs of lines that are parallel or perpendicular.