What two numbers added together equals 3and then when it is subtracted equals 7

x + y = 3

+

x - y = 7

2x = 10 ---->

5 + y = 3 ---->

5 + (- 2) = 3

5 - (- 2) = 7

+

x - y = 7

2x = 10 ---->

**x = 5**5 + y = 3 ---->

**y = - 2**5 + (- 2) = 3

5 - (- 2) = 7