Respuesta :

Answer:

9

Step-by-step explanation:

Answer:

y-intercept = 9

Step-by-step explanation:

[tex]y = 3x^2+9[/tex]

Let x equal 0

[tex]y=3(0)^2 +9\\\\y= 3\times 0 +9\\\\y = 0+9\\\\y=+9[/tex]