If by eliminating $x$ between the equation ${x^2} + ax + b = 0$ and $xy + l\left( {x + y} \right) + m = 0$,a quadratic in $x$. Then either $a = 2l$ and $b = m$ or $b + m = al.$
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If by eliminating $x$ between the equation ${x^2} + ax + b = 0$ and $xy + l\left( {x + y} \right) + m = 0$,a quadratic in $x$. Then either $a = 2l$ and $b = m$ or $b + m = al.$