Use the parametric, to investigate whether these lines intersect at a point, or not.

L1 : (x, y, z) = (1, 2, 1) + t(1, 0, 8), t ∈ R 

L2 : (x, y, z) = (1, 2, 3) + s(−2, 1, 2), s ∈ R 1)