JEE Mathematics Online Test Straight Line Set A

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Question 1

Question

The lines a1x + b1y + c1= 0 and a2x + b2y + c2 = 0 are perpendicular to each other if

Answer

a1b1 + a2b2 = 0

a1b1 – b1a2 = 0

None of these

a1a2 + b1b2 = 0