Which method should be used to solve the system? Explain your answer, including a description of the first step.
-$$\begin{aligned}
7 x ^ { 2 } + 8 y ^ { 2 } & = 4 \
- 2 x ^ { 2 } + 7 y ^ { 2 } & = 49
\end{aligned}$$

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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.
-$$\begin{aligned}
7 x ^ { 2 } + 8 y ^ { 2 } & = 4 \
- 2 x ^ { 2 } + 7 y ^ { 2 } & = 49
\end{aligned}$$

Which Method Should Be Used to Solve the System? Explain 7x2+8y2=4−2x2+7y2=49\begin{aligned}7 x ^ { 2 } + 8 y ^ { 2 } & = 4 \\- 2 x ^ { 2 } + 7 y ^ { 2 } & = 49\end{aligned}7x2+8y2−2x2+7y2​=4=49​

Which Method Should Be Used to Solve the System? Explain $\begin{aligned}7 x ^ { 2 } + 8 y ^ { 2 } & = 4 \\- 2 x ^ { 2 } + 7 y ^ { 2 } & = 49\end{aligned}$