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 3

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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