Toán Lớp 9: {4x-y-2 {8x+3y=5
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Vậy $y=1;x=\dfrac{1}{4}$
$#thanhmaii2008$
\left\{ \begin{array}{l}
4x + y = 2\\
8x + 3y = 5
\end{array} \right.\\
\Leftrightarrow \left\{ \begin{array}{l}
8x + 2y = 4\\
8x + 3y = 5
\end{array} \right.\\
\Leftrightarrow \left\{ \begin{array}{l}
y = 1\\
4x + y = 2
\end{array} \right.\\
\Leftrightarrow \left\{ \begin{array}{l}
y = 1\\
4x = 1
\end{array} \right.\\
\Leftrightarrow \left\{ \begin{array}{l}
y = 1\\
x = \dfrac{1}{4}
\end{array} \right.\\
\Rightarrow y = 1\,\,va\,\,x = \dfrac{1}{4}
\end{array}\]