X^2 - 3Y^2 = 4
X + Y = 6
-----------------
X = 6 - Y
( 6 - Y)^2 - 3Y^2 = 4
36 - 12Y + Y^2 - 3Y^2 = 4
- 2Y^2 - 12Y + 36 = 4
2Y^2 + 12Y - 32 = 0
2 * ( Y^2 + 6Y - 16 ) = 0
D = 36 + 64 = 100 ; √ D = 10
Y1 = ( - 6 + 10 ) : 2 = 2
Y2 = ( - 6 - 10 ) : 2 = - 8
-----------------------
X1 = 6 - 2 = 4
X2 = 6 + 8 = 14
-----------------------
ОТВЕТ ( 4 ; 2 ) ; ( 14 ; - 8 )