Toán Lớp 10: \(\left[ \begin{array}{l}2x+3y=5\\3x+y=4\end{array} \right.\)
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Toán Lớp 10: \(\left[ \begin{array}{l}2x+3y=5\\3x+y=4\end{array} \right.\)
Comments ( 2 )
$\begin{cases}2x+3y=5\\3x+y=4\end{cases}$
<=> $\begin{cases}2x+3y=5\\3(3x+y)=4.3\end{cases}$
<=> $\begin{cases}2x+3y=5\\9x+3y=12\end{cases}$
<=> $\begin{cases}2x+3y=5\\9x+3y-(2x+3y)=12-5\end{cases}$
<=> $\begin{cases}2x+3y=5\\7x=7\end{cases}$
<=> $\begin{cases}1.2+3y=5\\x=1\end{cases}$
<=> $\begin{cases}y=1\\x=1\end{cases}$
Vậy x=y=1