Write the Word or Phrase That Best Completes Each Statement $$\begin{aligned}2 x ^ { 2 } + y ^ { 2 } & = 1 \\- 7 x ^ { 2 } + 5 y ^ { 2 } & = 16\end{aligned}$$

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.
$$\begin{aligned}2 x ^ { 2 } + y ^ { 2 } & = 1 \\- 7 x ^ { 2 } + 5 y ^ { 2 } & = 16\end{aligned}$$