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If the lines (x-1)/2=(y+1)/3=(z-1)/4 an...

If the lines `(x-1)/2=(y+1)/3=(z-1)/4` and `(x-3)/1=(y-k)/2=z/1` intersect, then k is equal to (1) `-1` (2) `2/9` (3) `9/2` (4) 0

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`L_1 = (x-1)/2 = (y+1)/2 = (z-1)/4 `; passes from (1,-1,1)
`L_2 = (x-3)/1 = (y-k)/2 = z/1` ; passes from (3,k,0)
`L_1 & L_2` are in same plane
`Dr's of L_1 = (2,2,4)`
`Dr's of L_2 = (1,2,1)`
line `L_3 ` passes from (1,-1,1) & (3, k ,0)
`Dr's of L_3 = (2, k+1, -1)`
`L_1, L_2, L_3 `are coplanar
...
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