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The tangent at a point P of a curve meet...

The tangent at a point P of a curve meets the y-axis at A, and the line parallel to y-axis through P meets the x-axis at B. If area of `DeltaOAB` is constant (O being the origin), Then the curve is

A

`cx^(2)-xy+k=0`

B

`y^(2)+2x^(2)=cx`

C

`3x^(2)+4y^(2)=k`

D

`xy-x^(2)y^(2)+kx=0`

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The correct Answer is:
A
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