Помогите решить систему

xy-x=4
2x+y=7

xy - x = 4 { 2x + y = 7 => y = 7 - 2x x*(7 - 2x) - x = 4 7x - 2x^2 - x = 4 2x^2 - 6x + 4 = 0 (:2) x^2 - 3x + 2 = 0 x1 = -2 x2 = -1 y1 = 7 - 2x1 = 7 - 2*(-2) = 11 y2 = 7 - 2x2 = 7 - 2*(-1) = 9