Solve by Using Either the Addition Method or the Substitution

Solve by using either the addition method or the substitution method. $$\begin{array} { l } \frac { 1 } { 8 } x + \frac { 1 } { 5 } y = - \frac { 31 } { 20 } \\\frac { 7 } { 8 } x + \frac { 5 } { 8 } y = - \frac { 31 } { 4 }\end{array}$$

A) $( - 14,1 )$
B) $( - 6 , - 4 )$
C) $( 2 , - 9 )$
D) $( - 11,3 )$

Correct Answer:

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