Algebra 1 word problem

Question

The sum of the two numbers is 13. Their difference is 3. Find the numbers. help me work this out, please.

Answer 1

x+y= 15

x-y =3

add the two equations to eliminate one variable

2x = 18

x = 18/2 = 9

y =15-9 = 6

one number is 6, the other is 9