Question

Решите систему уравнений х+у=5  х^2+4у=8

Answer 1

{x+ y = 5
{x^2 + 4y  =8

{x = 5-y
{x^2  +4y = 8

{x=5-y
{25 - 10y + y^2 + 4y = 8

{x = 5-y
{y^2 - 6y + 17 = 0

y^2 - 6y + 17 = 0
D1 = 9 - 17<0 решений нет

Answer 2

1) x+y=5
x+y-5=0
2) x+4y-8=0