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#### paulmdrdo

##### Active member

- May 13, 2013

- 386

the sum of two numbers is 9 and their difference is 6. what are the numbers?

thanks!

- Thread starter paulmdrdo
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- Thread starter
- #1

- May 13, 2013

- 386

the sum of two numbers is 9 and their difference is 6. what are the numbers?

thanks!

- Jan 30, 2012

- 2,533

Let $x$ be the smaller of the two numbers. Since the difference is 6, the other number is $x+6$. Now try writing the equation saying that the sum of these numbers is 9 and try solving it.the sum of two numbers is 9 and their difference is 6. what are the numbers?

- Feb 15, 2012

- 1,967

$x + y = 9$

$x - y = 6$

The second equation tells us:

$x = y + 6$

So substitute that value for $x$ into the first equation, to get an equation in the single variable $y$.