Toán Lớp 9: $\left \{ {{x-y=4} \atop {3x+2y=7}} \right.$
Giải hệ pt giúp e
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Toán Lớp 9: $\left \{ {{x-y=4} \atop {3x+2y=7}} \right.$
Giải hệ pt giúp e
Comments ( 2 )
\left\{ \begin{array}{l}
x – y = 4\\
3x + 2y = 7
\end{array} \right.\\
\Leftrightarrow \left\{ \begin{array}{l}
2x – 2y = 8\\
3x + 2y = 7
\end{array} \right.\\
\Leftrightarrow \left\{ \begin{array}{l}
5x = 15\\
x – y = 4
\end{array} \right.\\
\Leftrightarrow \left\{ \begin{array}{l}
x = 3\\
y = x – 4
\end{array} \right. \Rightarrow \left\{ \begin{array}{l}
x = 3\\
y = 3 – 4 = – 1
\end{array} \right.\\
\Rightarrow \left( {x;y} \right) = \left( {3; – 1} \right)
\end{array}$