maths
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?
asked by
mia

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?
posted by Reiny

thank you very much!! xx (=
posted by mia
Respond to this Question
Similar Questions

math
Julia works at a music store. One of her jobs is to stock new CDs on the shelf. A recent order arrived with 215 classical CDs, 125 jazz CDs and 330 soft rock CDs. Julia needs to place the CDs on sale racks with 5 CDs in each 
Math
Henry went to two different music stores to buy some new CDs. At Store A he bought 5 CDs for $70. At Store B he bought 6 CDs for $78. Which store had the best price for a CD and by how much? 
math
You are at the music store to buy some CDs. You have $45 to spend and the store sells CDs for 12.99 each. Write an inequality that represents the number, n, of CDs that you can buy without spending more money than you have. help 
Maths
The owner of a music store received a shipment of 1,532 cds the CDs came in 37 boxes the same number of cds were in 36 of the boxes how many cds were in the remaining box 
Math
At a local music store CDs cost 11.99including tax is the number of CDs purchased proportional to the cost of the CDs 
Math
I have a math problem. Joleen saved $85 dollars from babysitting to spend on CDs. Every Monday a music store has all CDs on sale for $5.95 each. How much change will she receive buying as many CDs as possible? Thanks 
Math
George bought some CDs at his local store. He paid $15.95 for each CD. Nora bout the same number of CDs from a store online. She paid $13.95 for each CD, but had to pay $8 for shipping. In the end, both George and Nora spent the 
Math
Caitlin has a $10 gift certificate to a music store. She has chosen a number of CDs from the $7 bargain bin.If the cost of the CDs is $32 after the gift certificate is credited how many CDs did she buy? 
Math
A music store sells tapes for $10 and XDS for $15. Someone buys 5 items in this store and pays $60 How many of these items were tapes and how many were CDS? x=tapes and Y=CDS Are the two equations x+y=60 and 10x+15y=60? 
English
1. If you want to buy books, to which floor do you have to go?  I have to go to the 4th floor. 2. On which floor can you buy a shirt?  I can buy a shirt on the 3rd floor. 3. Where can you buy shoes?  On the first floor. 4. At