Find the Solution to the System of Equations by Substitution $$\begin{array} { l } x + y = - 6 \\x - y = 15\end{array}$$

question 78

Multiple Choice

Find the solution to the system of equations by substitution.
- $$\begin{array} { l } x + y = - 6 \\x - y = 15\end{array}$$

• A)(4.5, -10.5)
• B)(6, -10.5)
• C)(4.5, 10.5)
• D)(6, 4.5)

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