\(\left\{{}\begin{matrix}4x-3y=2\\x+y=4\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}4x-3y=2\\3x+3y=12\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x=2\\y=2\end{matrix}\right.\)
\(5x_0-2y_0=5\cdot2-2\cdot2=6\)
\(\left\{{}\begin{matrix}4x-3y=2\\x+y=4\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}16-7y=2\\x=4-y\end{matrix}\right.\)
\(\Leftrightarrow\left\{{}\begin{matrix}y=2\\x=4-2=2\end{matrix}\right.\)
\(=>5x_0-2y_0=5.2-2.2=6\)