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Condition That 2 Lines Are Coplanar

The value of ...

Question

The value of p for which the straight lines $\to r = (2^i + 9^j + 13^k) + t (^i + 2^j + 3^k)$ and $\to r = (- 3^i + 7^j + p^k) + s (-^i + 2^j - 3^k)$ are coplanar is

A

-1

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B

1

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C

-2

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D

2

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Solution

The correct option is C -2
$∣ ∣ ∣ ∣ \begin{matrix} 5 & 2 & 13 - p 1 & 2 & 3 - 1 & 2 & - 3 \end{matrix} ∣ ∣ ∣ ∣ = 0$ gives p = - 2

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Similar questions

Q. Find the angle between the planes whose vector equations are

\to r . (2^i + 2^j - 3^k) = 5

\to r . (3^i - 3^j + 5^k) = 3

Q. The value of p for which the straight lines

\to r = (2^i + 9^j + 13^k) + t (^i + 2^j + 3^k)

\to r = (- 3^i + 7^j + p^k) + s (-^i + 2^j - 3^k)

are coplanar is

Q. The value of p for which the straight lines

\to r = (2^i + 9^j + 13^k) + t (^i + 2^j + 3^k)

\to r = (- 3^i + 7^j + p^k) + s (-^i + 2^j - 3^k)

are coplanar is

Q. The value of p for which the straight lines

\to r = (2^i + 9^j + 13^k) + t (^i + 2^j + 3^k)

\to r = (- 3^i + 7^j + p^k) + s (-^i + 2^j - 3^k)

are coplanar is

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L_{1}

L_{2}

L_{1} : \to r = 2^i + 9^j + 13^k + λ (^i + 2^j + 3^k); L_{2} : \to r = - 3^i + 7^j + p^k + μ (-^i + 2^j - 3^k)

L_{1}

L_{2}

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