KCET 2020 Math Solved Paper

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Question : 39 of 60

Marks: +1, -0

The two lines 𝑙𝑥 + 𝑚𝑦 = 𝑛 and 𝑙′𝑥 + 𝑚′𝑦 = 𝑛′ are perpendicular if

𝑙𝑚′ + 𝑚𝑙′ = 0
𝑙𝑙′ + 𝑚𝑚′ = 0
𝑙𝑚′ = 𝑚𝑙′
𝑙𝑚 + 𝑙′𝑚′ = 0

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