The plane 5x + y + kz + 1 = 0 and directional ratios of a line (3, -1, 1) are parallel, find k.

(a) 4

(b) -14

(c) 6

(d) -8

I got this question in an international level competition.

This key question is from Three Dimensional Geometry in portion Three Dimensional Geometry of Mathematics – Class 12

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