Solve the System of Equations by the Substitution Method $\left\{ \begin{array} { l } x + 8 y = - 7 \\- 7 x + 7 y = - 77\end{array} \right.$

question 142

Multiple Choice

Solve the system of equations by the substitution method.
- $\left\{ \begin{array} { l } x + 8 y = - 7 \\- 7 x + 7 y = - 77\end{array} \right.$

• A) \(( - 9 , - 1 )\)
• B) \(( 8 , - 1 )\)
• C) no solution
• D) \(( 9 , - 2 )\)

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