Parametrization of $ax^2+bxy+c=0$

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Can I just fix $y=t$ and use quadratic formula to get the rational points of the diophantine $$ax^2+bxy+c=0?$$ or is there another method? I feel like I am turning in circles with the quadratic formula.

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Why don't you just use the quadratic formula to solve for $x$ and use that to set conditions on $y$?