The sum of two numbers is 17 and their differences is 29. What are the two numbers?

X + y = 17

x - y = 29

x = 17 - y

x - y = 29

x = 17 - y

17 - y - y = 29

x = 17 - y

17 - 2y = 29

x = 17 - y

- 2y = 29 - 17

x = 17 - y

-2y = 12

x = 17 - y

y = - 6

x = 17 - (-6)

y = - 6

x = 17 + 6

y = - 6

x = 23

y = - 6