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The line (x-1)/2 = (y+3)/4 = (z-5)/6 has direction cosines:
A1/2, 1/4, 1/6
B1/√14, 2/√14, 3/√14
C1/14, 2/14, 3/14
D2/√14, 4/√14, 6/√14
Answer & Solution
Correct answer: B. 1/√14, 2/√14, 3/√14
The ratios 2, 4, 6 have length √56 = 2√14, so dividing gives 1/√14, 2/√14, 3/√14.
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