Question

Решение систем уравнений второй степени

Answer 1

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Answer 2

$left { {x^2+y^2=89} atop {x=3-y}} right. \ 9-6y+y^2+y^2=89 \ 2y^2-6y-80=0 \ D=36+640=676=26^2 \ y1=-5 \ y2=8 \ x1=8 \ x2=-5$