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If the lines x = ay + b, z = cy + d and x = a ′ z + b ′ , y = c ′ z + d ′ are perpendicular then :

1. cc ′ + a + a ′ = 0
2. aa ′ + c + c ′ = 0
3. bb ′ + cc ′ + 1 = 0
4. ab ′ + bc ′ + 1 = 0

Correct answer: aa ′ + c + c ′ = 0

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