4а+5> 3·(3-2a)
4a + 5 > 9 - 6a
4a + 6a > 9 - 5
10 a > 4
a > 0,4
Ответ при а > 0,4
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)
x*x+x*4-4*x-4*4-6x-(x-2)*2=0