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

\begin{equation}x+4y=5\textrm{ },\textrm{ }-x+5y=-8\end{equation}

\begin{equation}8x-4y=-5\textrm{ },\textrm{ }4x+4y=9\end{equation}

\begin{equation}\frac{1}{4} \times x-\frac{5}{4} \times y=-(\frac{9}{4})\textrm{ },\textrm{ }(-(\frac{1}{4})) \times x+5y=3\end{equation}

\begin{equation}2x-5y=-3\textrm{ },\textrm{ }3x+5y=8\end{equation}

\begin{equation}x+8y=-10\textrm{ },\textrm{ }-x+2y=-10\end{equation}

\begin{equation}2x+y=-2\textrm{ },\textrm{ }7x-y=-7\end{equation}

\begin{equation}4x+7y=7\textrm{ },\textrm{ }4x+2y=5\end{equation}

\begin{equation}(-16)x+4y=7\textrm{ },\textrm{ }2x+2y=8\end{equation}

\begin{equation}7x+10y=4\textrm{ },\textrm{ }5x+4y=4\end{equation}

\begin{equation}3x+y=4\textrm{ },\textrm{ }(-6)x+y=-4\end{equation}

\begin{equation}4x-3y=-2\textrm{ },\textrm{ }7x=6+3y\end{equation}

\begin{equation}x-2y=9\textrm{ },\textrm{ }(-10)x=2y+6\end{equation}

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

\begin{equation}y-8x=3\textrm{ },\textrm{ }6y-x=9\end{equation}

\begin{equation}(-5)x+y=0\textrm{ },\textrm{ }7x+6y=-7\end{equation}