Which method should be used to solve the system? Explain your answer, including a description of the first step.
-$$\begin{aligned}
- 7 x ^ { 2 } + y ^ { 2 } & = 64 \
- 5 x ^ { 2 } + 4 y ^ { 2 } & = 100
\end{aligned}$$

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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.
-$$\begin{aligned}
- 7 x ^ { 2 } + y ^ { 2 } & = 64 \
- 5 x ^ { 2 } + 4 y ^ { 2 } & = 100
\end{aligned}$$

Which Method Should Be Used to Solve the System? Explain −7x2+y2=64−5x2+4y2=100\begin{aligned}- 7 x ^ { 2 } + y ^ { 2 } & = 64 \\- 5 x ^ { 2 } + 4 y ^ { 2 } & = 100\end{aligned}−7x2+y2−5x2+4y2​=64=100​

Which Method Should Be Used to Solve the System? Explain $\begin{aligned}- 7 x ^ { 2 } + y ^ { 2 } & = 64 \\- 5 x ^ { 2 } + 4 y ^ { 2 } & = 100\end{aligned}$