Respuesta:
Explicación paso a paso:
[tex]a)\begin{bmatrix}3x+y=-7\\ -x+y=9\end{bmatrix}\\\\\begin{bmatrix}-\frac{-7-y}{3}+y=9\end{bmatrix}\\\\\begin{bmatrix}\frac{7+4y}{3}=9\end{bmatrix}\\\\x=\frac{-7-5}{3}\\\\x=-4\\\\x=-4,\:y=5[/tex]
[tex]b)\begin{bmatrix}x+y=3\\ 4x+3y=12\end{bmatrix}\\\\\begin{bmatrix}4\left(3-y\right)+3y=12\end{bmatrix}\\\\\begin{bmatrix}12-y=12\end{bmatrix}\\\\x=3-0\\\\x=3\\\\x=3,\:y=0[/tex]
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Respuesta:
Explicación paso a paso:
[tex]a)\begin{bmatrix}3x+y=-7\\ -x+y=9\end{bmatrix}\\\\\begin{bmatrix}-\frac{-7-y}{3}+y=9\end{bmatrix}\\\\\begin{bmatrix}\frac{7+4y}{3}=9\end{bmatrix}\\\\x=\frac{-7-5}{3}\\\\x=-4\\\\x=-4,\:y=5[/tex]
[tex]b)\begin{bmatrix}x+y=3\\ 4x+3y=12\end{bmatrix}\\\\\begin{bmatrix}4\left(3-y\right)+3y=12\end{bmatrix}\\\\\begin{bmatrix}12-y=12\end{bmatrix}\\\\x=3-0\\\\x=3\\\\x=3,\:y=0[/tex]