Solve the systems of equations as an ordered pair: x - 2y = 7 x = y + 4
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Solve the systems of equations x+3y=7 2x+y=4
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Substitute the $x$ - and $y$ -values indicated by the ordered pair to determine if it solves the system. $$\left\{\begin{array}{l}3 x+7 y=-4 \\7 x+8 y=-21\end{array}\right.$$ $$(-6,2)$$
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Solve each system by the elimination method. $$ \begin{aligned} &7 x+2 y=0\\ &4 y=-14 x \end{aligned} $$
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