The sum of two numbers is 68. Their difference is 15. Write a system of equations you could use to solve this problem.

Answer 1

A "sum" means that we will be using addition, while a "difference" indicates subtraction. Anytime we have two unknown numbers we generally use "x" and "y". Therefore, two equations we can use to represent this are:

x + y = 68

x - y = 15

Answer 2

x+y=68

x-y=15