Which Method Should Be Used to Solve the System? Explain $\begin{aligned} x^{2}+y^{2} & =1 \\ x-7 y & =-2\end{aligned}$

Essay

Which method should be used to solve the system? Explain your answer, including a description of the first step.
- $\begin{aligned} x^{2}+y^{2} & =1 \\ x-7 y & =-2\end{aligned}$