\(\left\{{}\begin{matrix}2x-3y=19\\3x+4y=-14\end{matrix}\right.\) \(\Leftrightarrow\left\{{}\begin{matrix}8x-12y=76\\9x+12y=-42\end{matrix}\right.\) \(\Leftrightarrow\left\{{}\begin{matrix}17x=34\\2x-3y=19\end{matrix}\right.\)\(\Leftrightarrow\left\{{}\begin{matrix}x=2\\2.2-3y=19\end{matrix}\right.\) \(\Leftrightarrow\left\{{}\begin{matrix}x=2\\y=-5\end{matrix}\right.\)
Vậy nghiệm của hệ phương trình là: \(\left\{{}\begin{matrix}x=2\\y=-5\end{matrix}\right.\)