Solve the Problem $$\left\{ \begin{array} { l } x = - y \\x + y = 6\end{array} \right.$$

question 87

Multiple Choice

Solve the problem.
- $$\left\{ \begin{array} { l } x = - y \\x + y = 6\end{array} \right.$$

• A) \(\{ ( 1,5 ) \}\)
• B) no solution; \(\varnothing\)
• C) infinitely many solutions; \(\{ ( x , y ) \mid x + y = 6 \}\) or \(\{ ( x , y ) \mid x = - y \}\)
• D) \(\{ ( 1,1 ) \}\)

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