Posted by **Alysha** on Wednesday, May 6, 2009 at 4:25pm.

the sum of two numbers is 99, the difference of those two numbers is 9. what are the two numbers???

- MATH!!!!!! -
**Anonymous**, Wednesday, May 6, 2009 at 4:28pm
I believe 54 and 45 would work.

- MATH!!!!!! -
**Alysha**, Wednesday, May 6, 2009 at 4:30pm
yep it does ty...it was an easy problem i just didn't feel like solving it so thnx =]

- MATH!!!!!! -
**RickP**, Wednesday, May 6, 2009 at 6:26pm
But no work was shown. Was this just trial and error, or was math used?

"the sum of two numbers is 99"

x + y = 99

"the difference of those two numbers is 9."

x - y = 9

Solve one equation for either variable.

x - y = 9

x = y + 9

now substitute this value for x into the other equation.

x + y = 99

(y + 9) + y = 99

2y + 9 = 99

2y = 90

y = 45

Now substitute that numeric value for y into one of the original equations to find the numeric value of x.

x + y = 99

x + 45 = 99

x = 54

## Answer This Question

## Related Questions

- algebra - Solve by setting up the proper equation to describe the facts given ...
- algebra - production of two numbers is 19951 and sum of those two numbers is 280...
- Integers - Suppose a1, a2, . . . , an is a list of n numbers with the following ...
- Int Algebra - The difference of two numbers is 7. The sum of the numbers is -1. ...
- Math - When factoring a trinomial that is in the format Ax^2 + Bx + C, the ...
- math - if the sum of two numbers are 35 and the product of that two numbers are ...
- Perry - The sum of two numbers is 15 the sum of the squares of the same two ...
- 1st grade math - The sum of two numbers is 16. The difference between the two ...
- algebra - jordan has two numbers that have the sum of 64. those same two numbers...
- algebra - Are the following true or false? 1. The difference of two natural ...

More Related Questions