Question

Giai chi tiết dùm mình ạ .Mình cảm ơn 

Answer 1

\(\Leftrightarrow\left\{{}\begin{matrix}5x=10\\2x-y=3\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x=2\\y=2x-3=1\end{matrix}\right.\)

Answer 2

\(\Leftrightarrow\left\{{}\begin{matrix}y=2x-3\\3x+2x-3=7\end{matrix}\right.\\ \Leftrightarrow\left\{{}\begin{matrix}y=2x-3\\5x=10\end{matrix}\right.\)

\(\Leftrightarrow\left\{{}\begin{matrix}y=2.2-3\\x=2\end{matrix}\right.\)

\(\Leftrightarrow\left\{{}\begin{matrix}y=1\\x=2\end{matrix}\right.\)