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Question

The condition for a pair of equations a1x+b1y+c1=0 and a2x+b2y+c2=0 to be parallel is


A

= .

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B

= .

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C

= = .

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D

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Solution

The correct option is B

= .


The condition for a pair of lines a1x+b1y+c1=0 and a2x+b2y+c2=0 to be parallel is a1a2=b1b2c1c2.


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