Решите систему уравнений х+у=5 х^2+4у=8
{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<br>
1) x+y=5 x+y-5=0 2) x+4y-8=0