Write the Word or Phrase That Best Completes Each Statement $$\begin{array} { l } x ^ { 2 } - y ^ { 2 } = 36 \\3 x - y = - 6\end{array}$$

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.
- $$\begin{array} { l } x ^ { 2 } - y ^ { 2 } = 36 \\3 x - y = - 6\end{array}$$

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Substitution should be used, b...

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