Solve the System by the Addition Method, If Possible A) 10
B) 6
C)

Multiple Choice

Solve the system by the addition method, if possible. If a solution exists, give the value of y. $$\left\{ \begin{array} { l } \frac { x - 10 } { 5 } + \frac { y + 7 } { 3 } = \frac { 8 } { 15 } \\\frac { x + 7 } { 3 } + \frac { y - 10 } { 7 } = \frac { 52 } { 21 }\end{array} \right.$$

A) 10
B) 6
C) $- 3$
D) 4
E) no solution