Solve the System by the Addition Method, If Possible A) $- 5$

Multiple Choice

Solve the system by the addition method, if possible. If a solution exists, give the value of y. $\left\{ \begin{array} { l } \frac { x - 10 } { 5 } + \frac { y + 3 } { 3 } = - \frac { 37 } { 15 } \\\frac { x + 3 } { 3 } + \frac { y - 10 } { 7 } = - \frac { 17 } { 21 }\end{array} \right.$

A) $- 5$
B) 1
C) -3
D) 7
E) no solution