Posted by **mia** on Sunday, October 18, 2009 at 10:35am.

you are at the music store looking for CDs. the store has CDs for $10 and $15. you have $55 to spend. write an equation that represents the different numbers of $10 and $15 CDs you can buy.

hmm now.. how do i do this?

- maths -
**Reiny**, Sunday, October 18, 2009 at 10:51am
your equation will be

10x + 15y = 55 or

2x + 3y = 11 or 2x = 11 - 3y

now we want only positive integer values of x and y.

clearly x < 6 and y < 4

Furthermore, if y is even, 11 - 3y will be odd, therefore x cannot be an integer.

So y has to be odd, and less than 4

Mmmm now, what do you think?

- maths -
**mia**, Sunday, October 18, 2009 at 11:28am
thank you very much!! xx (=

## Answer this Question

## Related Questions

- math - You are at the music store to buy some CDs. You have $45 to spend and the...
- Math - Henry went to two different music stores to buy some new CDs. At Store A ...
- Maths - The owner of a music store received a shipment of 1,532 cds the CDs came...
- Math - I have a math problem. Joleen saved $85 dollars from babysitting to spend...
- Math - Caitlin has a $10 gift certificate to a music store. She has chosen a ...
- English - 1. If you want to buy books, to which floor do you have to go? - I ...
- Math - A music store sells tapes for $10 and XDS for $15. Someone buys 5 items ...
- math - John and Paul work together at a music store. In one afternoon, they sold...
- math - i need to approximate profit in this equation 3. Hot Rocks Music sells ...
- Calc - In the first three days of its launch, the Galaxy Music Store sold 14 CDs...