Question

Решите систему уравнений
|5x+6y=-20
|9y+2x=25

Answer 1

$left { {{5x+6y=-20} atop {2x+9y=25}} right. left { {{10x+12y=-40} atop {-10x-45y=-125}} right. left { {{-33y=-165} atop {2x+9y=25}} right. left { {{y=5} atop {2x+45=25}} right. left { {{y=5} atop {2x=25-45}} right. left { {{y=5} atop {x=-10}} right.$
Ответ:$(-10;5)$