Find All Solutions for the System $\left\{ \begin{array} { l } x ^ { 2 } + y ^ { 2 } = 18 \\x - y = 0\end{array} \right.$

question 52

Essay

Find all solutions for the system. $\left\{ \begin{array} { l } x ^ { 2 } + y ^ { 2 } = 18 \\x - y = 0\end{array} \right.$

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