Question

Решите, пожалуйста!

Answer 1

{x-y=5                     {x=5+y
{x²+y²=81-2xy         {(5+y)²+y²=81-2y(5+y)
(5+y)²+y²=81-2y(5+y)
25+10y+y²+y²=81-10y-2y²
4y²+20y-56=0
y²+5y-14=0
D=25+56=81
y₁ = -5-9 / 2 = -7
y₂ = -5+9 / 2 = 2
x₁ = 5-7 = -2
x₂ = 5+2 = 7

Answer 2

Problem Statement

It seems that you have a mathematical problem that you would like me to solve. Could you please provide me with the specific problem or equation that you need help with?