The Sum of Two Numbers is 12 and Their Difference is 8

The sum of two numbers is 12 and their difference is 8. 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 12. In other words, x plus y equals 12 and can be written as equation A:

x + y = 12

The difference between x and y is 8. In other words, x minus y equals 8 and can be written as equation B:

x - y = 8

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

x - y = 8
x = 8 + y

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

x + y = 12
8 + y + y = 12
8 + 2y = 12
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 = 12
x + 2 = 12
X = 10

Summary: The sum of two numbers is 12 and their difference is 8. What are the two numbers? Answer: 10 and 2 as proven here:

Sum: 10 + 2 = 12
Difference: 10 - 2 = 8

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The Sum of Two Numbers is 12 and Their Difference is 9
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