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Lines ax+by =c and a'x + b'y=c' are mutu...

Lines `ax+by =c and a'x + b'y=c'` are mutually perpendicular then .......... of the following is valid.

A

`aa'=bb'`

B

`aa'+ bb'=0`

C

`aa'- bb' =0`

D

`ab'+ a'b=0`

Text Solution

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The correct Answer is:
B
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