The planes 5x + y + 3z + 1 = 0 and x + y kz + 6 = 0 are orthogonal, – McqOptions

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1.	The planes 5x + y + 3z + 1 = 0 and x + y kz + 6 = 0 are orthogonal, find k.
A.	4
B.	2
C.	6
D.	8
Answer» C. 6

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