

MCQOPTIONS
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1. |
Lines x = ay + b, z = cy + dand x = a'y + b', z = c'y + d'are perpendicular, if |
A. | aa' + cc' + 1 = 0 |
B. | aa' + cc' - 1 = 0 |
C. | ac + a'c' -1 = 0 |
D. | ac + a'c' + 1 = 0 |
Answer» B. aa' + cc' - 1 = 0 | |