Solve the System by the Addition Method $$\left\{ \begin{array} { r } x + 7 y = 68 \\3 x + 7 y = 78\end{array} \right.$$

question 66

Multiple Choice

Solve the system by the addition method. If there is no solution or an infinite number of solutions, so state. Use set
notation to express the solution set.
- $$\left\{ \begin{array} { r } x + 7 y = 68 \\3 x + 7 y = 78\end{array} \right.$$

• A) \(\{ ( 6,8 ) \}\)
• B) no solution; \(\varnothing\)
• C) \(\{ ( - 9,5 ) \}\)
• D) \(\{ ( 5,9 ) \}\)

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