The Sum of Two Numbers is 8 and Their Difference is 4

The sum of two numbers is 8 and their difference is 4. What are the two numbers? Let's start by calling the two numbers we are looking for x and y.

The sum of x and y is 8. In other words, x plus y equals 8 and can be written as equation A:

x + y = 8

The difference between x and y is 4. In other words, x minus y equals 4 and can be written as equation B:

x - y = 4

Now solve equation B for x to get the revised equation B:

x - y = 4
x = 4 + y

Then substitute x in equation A from the revised equation B and then solve for y:

x + y = 8
4 + y + y = 8
4 + 2y = 8
2y = 4
y = 2

Now we know y is 2. Which means that we can substitute y for 2 in equation A and solve for x:

x + y = 8
x + 2 = 8
X = 6

Summary: The sum of two numbers is 8 and their difference is 4. What are the two numbers? Answer: 6 and 2 as proven here:

Sum: 6 + 2 = 8
Difference: 6 - 2 = 4

Sum Difference Calculator
Do you want the answer to a similar problem? Enter the sum and difference here to find the two numbers:

The Sum of Two Numbers is 8 and Their Difference is 5
Using what you learned on this page, try to figure out the next problem on our list and then go here to check the answer.