Respuesta :

[tex]\bf -2x^2+9x=y\impliedby \textit{let's set y=0} \\\\\\ -2x^2+9x=0\implies x(-2x+9)=0\iff x(9-2x)=0 \\\\\\ \begin{cases} \boxed{x=0}\\ -----\\ 9-2x=0\\ -2x=9\\ \boxed{x=-\frac{9}{2}} \end{cases}[/tex]