A DJ found a music store that had a great collection of used CD's. he purshased 38 CD's for a total of $235. The purchase included CD's priced at either $5.00 or $8.00. How many CD's in each price category did the DJ buy?

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- March 5th 2006, 09:15 AMwild_flowr69CD's
A DJ found a music store that had a great collection of used CD's. he purshased 38 CD's for a total of $235. The purchase included CD's priced at either $5.00 or $8.00. How many CD's in each price category did the DJ buy?

- March 5th 2006, 09:54 AMtopsquarkQuote:

Originally Posted by**wild_flowr69**

.

Additionally, we know that 38 CDs were bought, so:

.

Two equations, two unknowns, so you can solve for x and y.

-Dan - March 5th 2006, 10:53 AMThePerfectHacker
Let me continue from topsquark's solution:

The equations

In the second equation solve for :

Substitute that into the first:

Now solve it,

Thus,

Thus,

Thus,