The sum of two numbers is 66 and the differences is 12. What are the numbers

Larger number = 39

Smaller number = 27

Step-by-step explanation:

x + y = 66

x - y = 12 Add

2x = 78 Divide by 2

2x/2 = 78/2

x = 39

x + y = 66 Substitute for x

39 + y = 66 Subtract 39 from both sides.

39-39+y=66-39 Combine

y = 27