The Sum of Two Numbers is 79 and Their Difference is 2

The sum of two numbers is 79 and their difference is 2. 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 79. In other words, x plus y equals 79 and can be written as equation A:

x + y = 79

The difference between x and y is 2. In other words, x minus y equals 2 and can be written as equation B:

x - y = 2

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

x - y = 2
x = 2 + y

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

x + y = 79
2 + y + y = 79
2 + 2y = 79
2y = 77
y = 38.5

Now we know y is 38.5. Which means that we can substitute y for 38.5 in equation A and solve for x:

x + y = 79
x + 38.5 = 79
X = 40.5

Summary: The sum of two numbers is 79 and their difference is 2. What are the two numbers? Answer: 40.5 and 38.5 as proven here:

Sum: 40.5 + 38.5 = 79
Difference: 40.5 - 38.5 = 2

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The Sum of Two Numbers is 79 and Their Difference is 3
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