Respuesta :

Answer:

29

Step-by-step explanation:

Max's age = x

John's age = y

We know:

  • x = y + 9
  • x + y = 49

Using the system of two functions, we plug the first equation inside the other:

(y + 9) + y = 49

2y = 40

y = 20

Now let's substitute this value into one of the equations so to find x

x = 20 + 9 = 29