Question

giải hệ pt:\(\left\{{}\begin{matrix}x+3y=4\\3x-2y=1\end{matrix}\right.\)

Answer 1

\(\Leftrightarrow\left\{{}\begin{matrix}2x+6y=8\\9x-6y=3\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}11x=11\\x+3y=4\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x=1\\y=1\end{matrix}\right.\)

Answer 2

\(\left\{{}\begin{matrix}x+3y=4\\3x-2y=1\end{matrix}\right.\)

⇔\(\left\{{}\begin{matrix}-3x-9y=-12\\3x-2y=1\end{matrix}\right.\)

⇔\(\left\{{}\begin{matrix}11y=-11\\x+3y=4\end{matrix}\right.\)

⇔\(\left\{{}\begin{matrix}x=1\\y=1\end{matrix}\right.\)