Э_ Элька _@_ 1)x+7=y 2)x=y-7 3)x=y-7 4) x=y-7 xy=-12 xy=-12 y(y-7)=-12 y^2 - 7y + 12 = 0 y1 = 3; y2 = 4 x1 = 3-7 = -4 x2 = 4-7 = -3 Ответ: x=-3 y=4 или x=-4 y=3