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If the three lines x-3y = p, ax + 2y = q...

If the three lines `x-3y = p, ax + 2y = q and ax + y = r` from a right-angled triangle then:

A

`a^(2)-9a+18=0`

B

`a^(2)-6a-12=0`

C

`a^(2)-6a-18=0`

D

`a^(2)-9a+12=0`

Text Solution

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The correct Answer is:
A
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