$\left \{ {{3x - 2y = -8} \atop {y - 2x = 5}} \right.$
⇔$\left \{ {{3x - 2y = -8} \atop {- 2x + y = 5}} \right.$
⇔$\left \{ {{3x - 2y = -8} \atop {-4x + 2y = 10}} \right.$
⇔$\left \{ {{-x= 2} \atop {3x - 2y = -8}} \right.$
⇔$\left \{ {{x=-2} \atop {3.-2 - 2y = -8}} \right.$
⇔$\left \{ {{x=-2} \atop {y =1}} \right.$