\begin{equation}7x+3y=9\textrm{ },\textrm{ }(-7)x+6y=5\end{equation}

\begin{equation}x+4y=7\textrm{ },\textrm{ }-x+5y=-6\end{equation}

\begin{equation}8x-2y=-9\textrm{ },\textrm{ }4x+2y=2\end{equation}

\begin{equation}\frac{1}{4} \times x-\frac{5}{4} \times y=-(\frac{6}{4})\textrm{ },\textrm{ }(-(\frac{1}{4})) \times x+5y=9\end{equation}

\begin{equation}3x-3y=-10\textrm{ },\textrm{ }8x+3y=8\end{equation}

\begin{equation}x+10y=-7\textrm{ },\textrm{ }-x+3y=-7\end{equation}

\begin{equation}6x+y=-4\textrm{ },\textrm{ }10x-y=-4\end{equation}

\begin{equation}2x+y=5\textrm{ },\textrm{ }2x+6y=8\end{equation}

\begin{equation}(-6)x+2y=7\textrm{ },\textrm{ }3x+8y=6\end{equation}

\begin{equation}7x+5y=8\textrm{ },\textrm{ }5x+7y=3\end{equation}

\begin{equation}3x+y=10\textrm{ },\textrm{ }(-3)x+y=-4\end{equation}

\begin{equation}4x-6y=-6\textrm{ },\textrm{ }2x=4+6y\end{equation}

\begin{equation}x-7y=7\textrm{ },\textrm{ }(-8)x=7y+10\end{equation}

\begin{equation}(-7)x+2y=4\textrm{ },\textrm{ }49x-y=-4\end{equation}

\begin{equation}y-9x=2\textrm{ },\textrm{ }3y-x=4\end{equation}

\begin{equation}(-7)x+y=0\textrm{ },\textrm{ }6x+7y=-4\end{equation}