Question

need help solving using process of elimination
x - y = 10
-x - y = 20

Answer 1

y = -15 & x = -5

Answer 2

thanks

Answer 3

medal ?

Answer 4

@vijay
Perhaps you are aware of it, but here is an extract of the code of conducts:

OpenStudy values the Learning process - not the ‘Give you an answer’ process
•Don’t post only answers - guide the asker to a solution.

The "asker" will benefit more if he/she actually learns how to do the problem, not just getting the point using given answers. Hope you understand.