[tex] \left \{ {{ x^{2}+ xy-3y=9 } \atop {{3x+2y=-1}} \right. [/tex]. Created by Герундий. algebra-ru

tex]...

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[tex] \left \{ {{ x^{2}+ xy-3y=9 } \atop {{3x+2y=-1}} \right. [/tex]

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Матов

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$x^2+xy-3y=9\\
3x+2y=-1\\
\\
x=\frac{-1-2y}{3}\\
\frac{-1-2y}{3}^2+ \frac{-1-2y}{3}*y-3y=9\\
 \frac{4y^2+4y+1}{9}+\frac{-y-2y^2}{3}-3y=9\\
4y^2+4y+1+3(-y-2y^2)-27y=81\\
y=-8\\
y=-5\\
x=5\\
x=3
$

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