Math miscellaneousHard
Question
The two lines x = ay + b, z = cy + d; and x = a′y + b′, z = c′y + d′ are perpendicular to each other if
Options
A.aa′ + cc′ = - 1
B.aa′ + cc′ = 1
C.
D.
Solution
Equation of lines 
Lines are perpendicular ⇒ aa′ + 1 + cc′ = 0.
Lines are perpendicular ⇒ aa′ + 1 + cc′ = 0.
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