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Show that the lines : (a) (x -1)/(3) =...

Show that the lines :
(a) `(x -1)/(3) = (y + 1)/(5) and (x - 2)/(4) = (y - 1)/(3) = (z + 1)/(-2)`
(b) `vec(r) = (hati + hatj) + lambda ( 2 hati - hatk)`
and `vec(r) = (2 hati - hatj) + mu (hati + hatk - hatk) ` do not intersect.

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