alleryStart learning →The line with direction ratios 2, 3, -1 is parallel to the plane kx + y + 5z = 7 when k is
A0
B2
C-1
D1
Answer & Solution
Correct answer: D. 1
Parallelism needs 2k + 3(1) + (-1)(5) = 0, so 2k = 2 and k = 1.
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