Вася Ответ { x^2+3xy-y^2=92 { x+3y=18 => x=18-3y { (18-3y)^2 + 3y*(18-3y) - y^2 = 92 324 - 108y + 9y^2 + 54y - 9y^2 - y^2 = 92 y^2 + 54y - 232 = 0 y1 = 58 y2 = 4 x1 = 18-3*58=156 x2 = 18-3*4=6