Х2 + y2 - 4x - 3y + 5 = 0
- 3x2 - 3y2 + 12x + 9y - 15 = 0
3x2 + 3y2 - 11x - 7y + 10 = 0
X + 2y - 5 = 0
X = 5 - 2y
X2 = 25 - 20y + 4y2
25 - 20y + 4y2 + y2 - 4( 5 - 2y ) - 3y + 5 = 0
5y2 - 20y + 25 - 20 + 8y - 3y + 5 = 0
5y2 - 20y + 5 + 5y + 5 = 0
5y2 - 15y + 10 = 0
5( y2 - 3y + 2 ) = 0
D = 9 - 8 = 1
y1 = ( 3 + 1 ) : 2 = 2
y2 = ( 3 - 1 ) : 2 = 1
X = 5 - 2y
X1 = 5 - 4 = 1
X2 = 5 - 2 = 3
Ответ ( 1 ; 2 ) ; ( 3 ; 1 )