Problem:

Show that the lines $\displaystyle L1: \frac {x-2}{3}$ = $\displaystyle \frac {y-3}{5}$ = $\displaystyle \frac {z-1}{1}$ and $\displaystyle L2: \frac {x-4}{1}$ = $\displaystyle \frac {y-1}{7}$ = $\displaystyle \frac {z}{2}$ are coplanar.

Comments:This is part of my final exam prep. Please help me out.