Use the Addition Method to Solve the System $$\left\{ \begin{array} { c } a + b = 3 \\a - b = - 1\end{array} \right.$$

Multiple Choice

Use the addition method to solve the system. $$\left\{ \begin{array} { c } a + b = 3 \\a - b = - 1\end{array} \right.$$

A) $( 1 , - 2 )$
B) $( 2,1 )$
C) $( 1,2 )$
D) $( - 1,2 )$
E) $( - 2 , - 1 )$