Решите способом сложения систему уравнения: x+y=5 x-y=7 2x+3y=-1 3x+5y=-2

1. $\left \{ {{x+y+x-y=5+7} \atop {y=5-x}} \right. \\ \left \{ {{2x=12} \atop {y=5-x}} \right. \\ \left \{ {{x=6} \atop {y=-1}} \right.$
2. $\left \{ {{-6x-9y=3 } \atop {6x+10y=-4}} \right. \\ \left \{ {{y= \frac{-4-6x}{10} } \atop {y=-1}} \right. \\ \left \{ {{y=-1} \atop {x=0,2}} \right.$