Предмет: Алгебра, автор: Krutoy4el

Решите пожайлуста.

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Автор ответа: Агаталове

x^2-xy-y^2+x+30=0
2x+y=4
x^2-xy-y^2+x+30=0
y=4-2x
x^2-x(4-2x)-(4-2x)^2+x+30=0 (1)
(1) x^2-4x+2x^2-16-4x^2+16x+x+30=0
-x^2+13x+14=0
D=169+56=225 корень из D=15
x1=-1
x2=14
y=4-2x
y1=4+2=6
y2=4-28=-24
Ответ:
x1=-1; x2=14
y1=6 ;y2=-24

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