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Let ax+by+c=0 be a variable straight lin...

Let ax+by+c=0 be a variable straight line, where a, b and c are `1^(st), 3^(rd) " and " 7^(th)` terms of an increasing A.P., respectively.
Then prove that the variable straight line always passes through a fixed point and find that point.

A

`x^2+y^2=13`

B

`x^2+y^2=5`

C

`y^2=9x`

D

`3x + 4y = 9`

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The correct Answer is:
A
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