Solve the System by the Addition Method $$\left\{ \begin{array} { r } 3 x + y = 10 \\12 x + 4 y = 40\end{array} \right.$$

Multiple Choice

Solve the system by the addition method.
- $$\left\{ \begin{array} { r } 3 x + y = 10 \\12 x + 4 y = 40\end{array} \right.$$

A) $\{ ( 0,10 ) \}$
B) $\varnothing$
C) $\{ ( 5 , - 5 ) \}$
D) $\{ ( x , y ) \mid 3 x + y = 10 \}$