Which method should be used to solve the system? Explain your answer, including a description of the first step.
-$$\begin{aligned}
9 x ^ { 2 } + 3 y ^ { 2 } & = 81 \
- 8 x ^ { 2 } - 10 y ^ { 2 } & = 9
\end{aligned}$$

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The Answer of Which method should be used to solve the system? Explain your answer, including a description of the first step.
-$$\begin{aligned}
9 x ^ { 2 } + 3 y ^ { 2 } & = 81 \
- 8 x ^ { 2 } - 10 y ^ { 2 } & = 9
\end{aligned}$$

Which Method Should Be Used to Solve the System? Explain 9x2+3y2=81−8x2−10y2=9\begin{aligned}9 x ^ { 2 } + 3 y ^ { 2 } & = 81 \\- 8 x ^ { 2 } - 10 y ^ { 2 } & = 9\end{aligned}9x2+3y2−8x2−10y2​=81=9​

Which Method Should Be Used to Solve the System? Explain $\begin{aligned}9 x ^ { 2 } + 3 y ^ { 2 } & = 81 \\- 8 x ^ { 2 } - 10 y ^ { 2 } & = 9\end{aligned}$