I need to find the plane determined by the two intersecting lines. I've done okay so far with similar problems, but never using two lines like this. Any pointing in the right direction would be greatly appreciated!

L1: x= -1+t y= 2+t z= 1-t -inf< t <inf

L2: x= 1-4s y= 1+2s z=2-2s -inf< s <inf