Write the Word or Phrase That Best Completes Each Statement $$\begin{aligned}9 x ^ { 2 } + 3 y ^ { 2 } & = 81 \\- 8 x ^ { 2 } - 10 y ^ { 2 } & = 9\end{aligned}$$

Essay

Write the word or phrase that best completes each statement or answers the question.
Which method should be used to solve the system? Explain your answer, including a description of the first step.
- $$\begin{aligned}9 x ^ { 2 } + 3 y ^ { 2 } & = 81 \\- 8 x ^ { 2 } - 10 y ^ { 2 } & = 9\end{aligned}$$