Respuesta :

marcthemathtutor

Answer:

y = 3

Step-by-step explanation:

Given:

x²+y²+3xy =-5  and x = -2

Substituting x=-2 into the equation:

(-2)² + y² + 3y(-2) = -5

4 + y² - 6y = -5

y² - 6y +4 + 5 = 0

y² - 6y +9  = 0   (solve by factorization)

(y-3) (y-3) = 0

y = 3