if ax^2+2hxy+by^2+2gx+2fy+c=0 then find ...

if `ax^2+2hxy+by^2+2gx+2fy+c=0` then find `dy/dx`

A

`-(ax+hy+g)/(hx+by+f)`

B

`(ax+hy+g)/(hx-by+f)`

C

`(ax-hy-g)/(hx-by-f)`

D

`(ax+hy+g)/(hx+by+f)`.

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