Originally Posted by

**cottontails** "Find the Cartesian equation of the plane containing the lines

*L*1 : x-1 = y/2 = (z+1)/-3

*L*2 : (x+1)/-2 = y-1, z = -1."

First of all, I tried writing out what was given into parametric scalar equations of *L*. However, I doubt that was the right thing to do as I was quite stuck with what to do next after that. I know that the Cartesian equation would be in the form: ax+by+cz = d (where d = ax0+by0+cz0) although, I am unsure with what to do, to get that equation. Is what I have done so far correct and if so, what do I from there? Or, is my approach towards this question wrong? I am moreover particularly confused as this question involves two lines, when I have generally only done questions involving one line/vector.