x^2-y^2=0,
x+2y=3
x^2-y^2=0
x=3-2y
(3-2y)^2-y^2=0
9-12y+4y^2-y^2=0
3y^2-12y+9=0
D=144-108=36
x1= 12+6/6=3
x2=12-6/6=1
y1=3-2*3=3-6=-3
y2=3-2*1=1
(3;-3);(1;1)
ответ: 2 решения
x^2-y^2=0,
x+2y=3
x^2-y^2=0
x=3-2y
(3-2y)^2-y^2=0
9-12y+4y^2-y^2=0
3y^2-12y+9=0
D=144-108=36
x1= 12+6/6=3
x2=12-6/6=1
y1=3-2*3=3-6=-3
y2=3-2*1=1
(3;-3);(1;1)
ответ: 2 решения