Solve the System by the Addition Method $$\begin{array} { l } x + y = - 6 \\x - y = 12\end{array}$$

question 2

Multiple Choice

Solve the system by the addition method.
- $$\begin{array} { l } x + y = - 6 \\x - y = 12\end{array}$$

• A) \(\{ ( 6 , - 9 ) \}\)
• B) \(\{ ( 6,3 ) \}\)
• C) \(\{ ( 3,9 ) \}\)
• D) \(\{ ( 3 , - 9 ) \}\)

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