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Question

If the straight lines x=1+s,y=3λs,z=1+λs and x=t2,y=1+t,z=2t with parameters s and t, respectively, are coplanar, then λ equal k, where k=

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Solution

The given lines are x1=y+3λ=z1λ=s ...(1)
and 2x=y1=z21=t ...(2)
The lines are coplanar, if
∣ ∣ ∣0(1)132(1)1λλ1211∣ ∣ ∣=0
Applying C2C2+C3
∣ ∣ ∣15110λ1201∣ ∣ ∣=0
5(1λ2)
λ=2
k=2

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