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Solve the System of Equations Using Elimination {x2+y2=81x2y2=81\left\{ \begin{array} { l } x ^ { 2 } + y ^ { 2 } = 81 \\x ^ { 2 } - y ^ { 2 } = 81\end{array} \right.

question 139

Multiple Choice

Solve the system of equations using elimination.
- {x2+y2=81x2y2=81\left\{ \begin{array} { l } x ^ { 2 } + y ^ { 2 } = 81 \\x ^ { 2 } - y ^ { 2 } = 81\end{array} \right.


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