Solve the System by the Addition Method $x + y = - 1$

question 117

Multiple Choice

Solve the system by the addition method.
- $x + y = - 1$ $x - y = 14$

• A) \(\{ ( 6.5 , - 7.5 ) \}\)
• B) \(\{ ( 6.5,7.5 ) \}\)
• C) \(\{ ( 1 , - 7.5 ) \}\)
• D) \(\{ ( 1,6.5 ) \}\)