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


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

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