Question

What two numbers has a sum of 18 and a difference of 8?

Answer 1

13 and 5

let's say the two numbers are x and y

x+y = 18

x-y= 8

x+y+x-y= 18+8

18+8 = 26

2x = 26

x = 13

18-13 = 5

y = 5