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

question 139

Multiple Choice

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

• A) x = 9, y = 9; x = -9, y = 9
• B) x = -9, y = 0; x = -9, y = 9
• C) x = 9, y = 0; x = -9, y = 0
• D) x = 9, y = 0; x = 9, y = 9

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