Question

30 баллов Решите систему неравенств 4х+у=-3 -y-x² =6

Answer 1

4x + y = - 3
- x^2 - y = 6
---------------------- + 
4x - x^2 = 3

- x^2 + 4x - 3 = 0 
x^2 - 4x + 3 = 0 
D = 16 - 12 = 4
x1 = (4 + 2)/2 = 6/2 = 3
x2 = (4 -  2)/2 = 2/2 = 1

x1 = 3
y1 = - 3  - 12 = - 15

x2 = 1
y1 = - 3 - 4 = - 7

Ответ
(3; - 15); (1; - 7)