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Determine Whether the Ordered Pair Is a Solution of the System

question 97

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Determine whether the ordered pair is a solution of the system.
- (3,−1) {x+y=2x−y=4\begin{array} { l } ( 3 , - 1 ) \\\left\{ \begin{array} { l } x + y = 2 \\x - y = 4\end{array} \right.\end{array}

Definitions:

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