[tex]\begin{cases} 3x+2y=-7 \\ 5x+2y=1\end{cases}\\\\ \begin{cases} 2y=-3x-7\ \ |:2 \\ 5x+2y=1\end{cases}\\\\\begin{cases} y=-\frac{3}{2}x-\frac{7}{2} \\ 5x+2y=1\end{cases}\\\\\begin{cases} y=-\frac{3}{2}x-\frac{7}{2} \\ 5x+2 (-\frac{3}{2}x-\frac{7}{2})=1\end{cases}\\\\\begin{cases} y=-\frac{3}{2}x-\frac{7}{2} \\ 5x-3x-7 =1\end{cases}[/tex]
[tex]\begin{cases} y=-\frac{3}{2}x-\frac{7}{2} \\ 2x =1+7\end{cases}\\\\\begin{cases} y=-\frac{3}{2}x-\frac{7}{2} \\ 2x=8\ \ |:2\end{cases}\\\\\begin{cases} y=-\frac{3}{2}x-\frac{7}{2} \\ x=4\end{cases}\\\\\begin{cases} y=-\frac{3}{2}*4-\frac{7}{2} \\ x=4\end{cases}\\\\\begin{cases} y=-\frac{3}{\not{2}^1 }*\not{4}^2-3\frac{1}{2} \\ x=4\end{cases}\\\\\begin{cases} y= -6-3\frac{1}{2} \\ x=4\end{cases} \\\\\begin{cases} y=- 9\frac{1}{2} \\ x=4\end{cases}[/tex]
