Solve the System by the Addition Method $$\left\{ \begin{array} { r } 5 x + 6 y = - 7 \\- 5 x - 13 y = 21\end{array} \right.$$

question 9

Multiple Choice

Solve the system by the addition method.
- $$\left\{ \begin{array} { r } 5 x + 6 y = - 7 \\- 5 x - 13 y = 21\end{array} \right.$$

• A) \(\{ ( - 1,2 ) \}\)
• B) \(\{ ( x , y ) \mid 5 x + 6 y = - 7 \}\)
• C) \(\varnothing\)
• D) \(\{ ( 1 , - 2 ) \}\)