Posted by Anonymous on Wednesday, August 1, 2012 at 4:32pm.
Which of the following pairs of vectors are orthogonal?
(i) v = 18i − 3j and w = −i − 6j
(ii) v = 15i − 2j and w = −4i + 30j
(iii) v = 3i − j and w = i + 3j
A. (i) and (ii)
B. (i) and (iii)
C. (ii) only
D. (i) only
17.

Trigonometry  MathMate, Wednesday, August 1, 2012 at 4:35pm
Calculate the dot product of the three pairs of vectors. If the dot product is zero, the vectors are orthogonal.
For example,
(i)<18,3>.<1,6>=18+18=0
So pair (i) is orthogonal.
Post your answer for checking if you wish.

Trigonometry  Steve, Wednesday, August 1, 2012 at 4:39pm
v•w = 0 if v┴w
18i−3j • −i−6j = 0
15i−2j • −4i+30j = 120
3i−j • i+3j = 0
Can you take it from here?
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