Solve the System by the Addition Method $$\left\{ \begin{array} { c } x + 8 y = 15 \\- 2 x + 7 y = - 7\end{array} \right.$$

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.
- $$\left\{ \begin{array} { c } x + 8 y = 15 \\- 2 x + 7 y = - 7\end{array} \right.$$

A) $\{ ( 6,2 ) \}$
B) $\{ ( - 7,2 ) \}$
C) $\{ ( 7,1 ) \}$
D) no solution; $\varnothing$