Answer:
The Answer is A. I'm answering if someone need an explanation.
Explanation:
If you read the question carefully you can see that first it says sum, sum is the answer of 2 numbers added like 2 + 2 = 4 so the first line will be
x + y = 1,212
and because only after sum it says difference, difference is an answer of two numbers that were subtracted like 2 - 2 = 0, that means that the second line is
x - y = 518
Answer will be:
x + y = 1,212
x - y = 518
Hope I helped some1)