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Two diameters of the circle 3x^(2)+3y^(2...

Two diameters of the circle `3x^(2)+3y^(2)-6x-18y-7=0` are along the lines `3x+y=c_(1) and x-3y=c_(2)`. Then, the value of `c_(1)c_(2)` is a)-48 b)80 c)-72 d)54

A

`-48`

B

80

C

`-72`

D

54

Text Solution

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The correct Answer is:
A
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