система уравнений

1) 2x+3y^3=1
-x^2+2кореньy=2

2) y-x^2-x=0
3x-x^2-y=0

3) п*x+y=1
2x-п*y=1

2. y=3x-5; x^2 + (3x-5)^2 = 10x^2 - 30x + 25 = 25, x^2 - 3x = 0, x1 = 0, x2 = 3; y1 = -5, y2 = 4. Ответ. (0; -5), (3; 4). 3. y=-2x+4; x^2 - 6x + 7 = -2x + 4, x^2 - 4x + 3 = 0, x1 = 1, x2 = 3; y1 = 2, y2 = -2. Ответ. (1;2), (3; -2). 4. y=2x-2; x(2x - 2) - 3(2x - 2) -4x = -10, 2x^2 - 2x - 6x + 6 - 4x + 10 = 0, 2x^2 -12x + 16 = 0, |:2 x^2 - 6x + 8 = 0, x1 = 2, x2 = 4; y1 = 2, y2 = 6. Ответ. (2;2), (4:6).    это пример