Х^2 + y = 6
y^2 + x = 6
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y = 6 - x^2
( 6 - x )^2 + x = 6
36 - 12x + x^2 + x - 6 = 0
x^2 - 11x + 30 = 0
D = 121 - 120 = 1
x1 = ( 11 + 1 ) : 2 = 6
x2 = ( 11 - 1 ) : 2 = 5
y1 = 6 - 6^2 = - 30
y2 = 6 - 5^2 = - 19
Ответ ( 6 ; - 30) ; ( 5 ; - 19 )