Question

помогите номер 1 зад

Answer 1

X+y=25
Xy =144
X=25-y
(25-y)y=144
25y-y^2=144
Y^2-25y+144=0
D=(-25)^2-4*144= 49
Y1,=25+72=16
Y2=25-72=9
X1=25-16=9
X2=25-9=16