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If a system of the form$$\begin{aligned}&A x+B y=0\\&C x+D y=0\end{aligned}$$has a single solution, what must that solution be?
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Solve for $x$ and $y$. $a x+b y+c=0$ $a x+c y+b=0$
Systems of Equations in Two Variables
Systems of Equations and Elimination
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