Solve the System by the Addition Method $$\left\{ \begin{array} { l } x + y = 8 \\x + y = 4\end{array} \right.$$

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.
- $$\left\{ \begin{array} { l } x + y = 8 \\x + y = 4\end{array} \right.$$

A) $\{ ( 8,4 ) \}$
B) no solution; $\varnothing$
C) $\{ ( 0,0 ) \}$
D) $\{ ( 0,12 ) \}$