a: \(\Leftrightarrow\left\{{}\begin{matrix}2x+3y=14\\15x-3y=3\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x=1\\y=5x-1=4\end{matrix}\right.\)
b: \(\Leftrightarrow\left\{{}\begin{matrix}8x-24y=8\\15x+24y=84\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x=4\\y=1\end{matrix}\right.\)
c: \(\Leftrightarrow\left\{{}\begin{matrix}9x+36y=-36\\24x-36y=168\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x=4\\y=-2\end{matrix}\right.\)
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