система уравнений 3x + 9y = -5 x +5y = -3

3x + 9y = -5x + 5y = -3x = -3 - 5y3(-3 - 5y) + 9y = -5x = -3 - 5y-9 - 15y + 9y = -5x = -3 - 5y-6y = 4x = -3 - 5yy = -2/3y = -2/3x = -3 + 10/3y = -2/3x = -1/3 Ответ: (-1/3; -2/3).