Solve the System of Equations by Using the Addition Method $7.7 x + 7.1 y = - 3.5$

Multiple Choice

Solve the system of equations by using the addition method.
-Solve the system by the addition method.
$7.7 x + 7.1 y = - 3.5$
$- 7.1 x - 7.3 y = 8.5$

A) $\{ ( 6 , - 7 ) \}$
B) $\{ ( 13.3 , - 14.1 ) \}$
C) $\{ ( - 1.1,0.7 ) \}$
D) $\{ ( 13.1 , - 14.7 ) \}$