Y + x = x² + 1
x² + 2y = 3
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y + x - x² = 1
2y + x² = 3
3y + x = 4
x = 4 - 3y
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( 4 - 3y )² + 2y = 3
16 - 24y + 9y² + 2y = 3
9y² - 22y + 13 = 0
D = 484 - 468 = 16 = 4²
y1 = ( 22 + 4 ) : 18 = 13/9 = 1 4/9
y2 = ( 22 - 4 ) : 18 = 1
x1 = 4 - 3*( 13/9 ) = 4 - ( 13/3 ) = 4 - 4 1/3 = - 1/3
x2 = 4 - 3*1 = 1
Ответ ( - 1/3 ; 1 4/9 ) ; ( 1 ; 1 )