If the straight lines $x=1+s,y=-3$$ - \lambda s,$ $z = 1 + \lambda s$ and $x = {t \over 2},y = 1 + t,z = 2 - t,$ with parameters $s$ and $t$ respectively, are co-planar, then $\lambda $ equals :

Question

If the straight lines
$x=1+s,y=-3$$ - \lambda s,$ $z = 1 + \lambda s$ and $x = {t \over 2},y = 1 + t,z = 2 - t,$ with parameters $s$ and $t$ respectively, are co-planar, then $\lambda $ equals :

$0$

$-1$

$ - {1 \over 2}$

$-2$

Solution

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