Выражаем у через х:у=-х+6
Х^2+(-х+6)^2=20
Х^2+х^2-12х+36=20
2х^2-12х+16=0
х^2-6х+8=0
D=36-32=4
Х=(6+2)/2=4. Х=(6-2)/2=2
У:4+у=6. У=2
2+у=6. У=4
Ответ:(4;2) и (2;4)
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4х+2х+1-8х^2-4х^2-2х=(8-16х)(х+2)
4х+2х+1-8х^2-4х^2-2х=8х+16-16х^2-32х
28х+4х^2=15