х^2-ху-у^2=19
х-у=3
x = 3 + y
(3 + y)^2 -(3 + y)y + y^2 = 19
9 + 6y + y^2 - 3y -y^2 + y^2 = 19
y^2 + 3y - 10 = 0
y= 5
y= -2
x= 8
x= 1
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х^2-ху-у^2=19
х-у=3
x = 3 + y
(3 + y)^2 -(3 + y)y + y^2 = 19
9 + 6y + y^2 - 3y -y^2 + y^2 = 19
x = 3 + y
y^2 + 3y - 10 = 0
y= 5
y= -2
x= 8
x= 1