Which Method Should Be Used to Solve the System? Explain $$\begin{aligned}2 x ^ { 2 } - 4 y ^ { 2 } & = 4 \\9 x + 9 y & = - 1\end{aligned}$$

Essay

Which method should be used to solve the system? Explain your answer, including a description of the first step.
- $$\begin{aligned}2 x ^ { 2 } - 4 y ^ { 2 } & = 4 \\9 x + 9 y & = - 1\end{aligned}$$