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Which Method Should Be Used to Solve the System? Explain x2+y2=815xy=1\begin{array} { l } x ^ { 2 } + y ^ { 2 } = 81 \\- 5 x - y = 1\end{array}

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Which method should be used to solve the system? Explain your answer, including a description of the first step.
- x2+y2=815xy=1\begin{array} { l } x ^ { 2 } + y ^ { 2 } = 81 \\- 5 x - y = 1\end{array}

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Substitution should be used, b...

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