Lines x = ay + b, z = cy + dand x = a'y + b', z = c'y + d'are perpendi – 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

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