Question

Решите уравнение методом по x+y=5 xy=6

Answer 1

$left { {{x+y=5} atop {xy=6}} right. \ \ left { {{y=5-x} atop {x(5-x)=6 }} right. \ \ x(5-x)=6 \ \ 5x-x^2=6 \ \ x^2-5x+6=0 \ \ x_1=2 \ x_2=3 \ \ y=5-x \ \ y_1=5-x_1=5-2=3 \ y_2=5-x_2=5-3=2 \ \ OTBET: (2;3); (3;2)$