х - 3y = 2
xy+y = 6
x = 2+3y
(2+3y)y+y-6=0
2y+3y^2+y-6=0
3y^2+3y-6=0 /3 -- сократим на три
y^2+y-2=0
D= 1+8 = 9
y1= -1+3/2=1
y2 = -1-3/2 = -2
x=2+3y
x1=2+3*1=5
x2=2+3*(-2)=-4
х - 3y = 2
xy+y = 6
x = 2+3y
(2+3y)y+y-6=0
2y+3y^2+y-6=0
3y^2+3y-6=0 /3 -- сократим на три
y^2+y-2=0
D= 1+8 = 9
y1= -1+3/2=1
y2 = -1-3/2 = -2
x=2+3y
x1=2+3*1=5
x2=2+3*(-2)=-4