Question

помогите пожалуйста

Answer 1

x =y+16
xy=80
(y+16)*y=80
y2+16y-80=0
y=-20 или y=4
x=-4 или x=20

Answer 2

$left { {{x-y=16} atop {xy=80}} right.; ; left { {x=y+16} atop {(y+16)y=80}} right.; ; left { {{x=y+16} atop {y^2+16y-80=0}} right. ; ; left { {{x=y+16} atop {y_1=-20; ,; y_2=4}} right. ; left { {{x_1=-4,; x_2=20} atop {y_1=-20,; y_2=4}} right. \\y^2+16y-80=0; ,\\frac{D}{4}=8^2+80=144; ; ; ; y_1=-8-12=-20; ,; y_2=-8+12=4\\Otvet:; ; (-4, ;-20); ,; ; (20, ;4); .$