Answer:
The numbers are 4 and 8
Step-by-step explanation:
Let a and y be the two numbers
x+y = 12
x-y = 4
Add the two equations together
x+y = 12
x-y = 4
----------------
2x = 16
Divide by 2
2x/2 = 16/2
x = 8
Then find y
x+y =12
8+y = 12
y = 12-8
y = 4
