Solve the System by the Substitution Method $$\left\{ \begin{array} { l } x + y = - 7 \\x - y = 15\end{array} \right.$$

question 65

Multiple Choice

Solve the system by the substitution method.
- $$\left\{ \begin{array} { l } x + y = - 7 \\x - y = 15\end{array} \right.$$

• A) \(\varnothing\)
• B) \(\{ ( 4 , - 11 ) \}\)
• C) \(\{ ( x , y ) \mid x + y = - 7 \}\)
• D) \(\{ ( 4,11 ) \}\)

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