Determine the Values of the Parameter S for Which the System

Multiple Choice

Determine the values of the parameter s for which the system has a unique solution, and describe the solution.
- $$\begin{array} { l } 2 x _ { 1 } + 2 x _ { 2 } = 26 \\2 x _ { 1 } - 2 x _ { 2 } = - 10\end{array}$$

A) $( 4,9 )$
B) $( - 4 , - 9 )$
C) $( 9,4 )$
D) $( - 9,4 )$