the sum of two numbers is 36. their difference is 24 HELP AND EXPLAIN PLS

Question

radar · Answer

x+y=36
x-y=24
-----------Add
2x=60   then x = 30
go ahead and solve for y

anonymous · Answer

y=6?

radar · Answer

Take one of the original like x-y=24
30-y=24    then y must be 6

anonymous · Answer

i was using subsitution
wasn't working for me

radar · Answer

Yes very good and correct.   I used elimination by adding eliminating the y.  Substitution should of worked also.

radar · Answer

do you want to see how substitution would of worked?

anonymous · Answer

I understand I thought subsitution was the only way and then you brought up addition and I remebered thank you very much.

radar · Answer

No problem.

anonymous · Answer

one more quesrion: The sum of two numbers is 10. Three times the larger decreased by twice the smaller is 15. What are the numbers