What is x + y = 12 if x = 2y

I believe the answer is 4.

x=8

y = 4

Step-by-step explanation:

x + y = 12 if x = 2y

Replace x with 2y in the first equation

2y+y = 12

Combine like terms

3y = 12

Divide by 3

3y/3 = 12/3

y = 4

Now we can find x

x=2y

x=2 (4)

x = 8