Решить систему {2y-x^2=1 {2y+x^2=19 Решите пожалуйста!:3

I must do homework by himself. I mustn’t tell you my secrets. I must do washing up. All citizens must obey the Law. You mustn’t come home late

2y - x^2 = 12y + x^2 = 19----------------------x^2 - x^2 = -18-2x^2 = - 182x^2 = 18x^2 = 9x1 = 3x2 = -32y = 1 + x^22y = 1 + 92y = 10y1 = 5y2 = 5 Ответ: (3;5) и (-3;5)