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Question

The lines x−41=y+1−2=z1 and 9x−1613=9y−17=z−1 are

A
coplanar
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B
paralle
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C
skew
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D
none of these
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Solution

The correct option is A coplanar
Given lines are
x41=y+12=z1 and 9x1613=9y17=z1

∣ ∣x1y1z1x2y2z2a2a1b2b1c2c1∣ ∣

∣ ∣ ∣ ∣ ∣410169190139179+211∣ ∣ ∣ ∣ ∣

∣ ∣ ∣ ∣ ∣410169190492592∣ ∣ ∣ ∣ ∣=0

On solving the above determinant is 0.
SO the given line are coplaner.

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