Question

The sum of two numbers is 51 and the difference is 29. What are the numbers?

Answer 1

40 and 11

Explanation:

Call the numbers x and y. Then we write

x + y = 51 and x - y = 29

When we add these equations we get

2x = 80

x = 40 so that

y = 11

Check!

40+11=51 40-11=29

Answer 2

X+y=51
X-y=29
2x=80
X=40 sooo y=11