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Mathematics

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Your purchase of CDs and DVDs has a total of 7 items. CDs cost9 each and DVDs cost 15 each. The total purchase costs 87 write and solve a system of equations to find x of CDs and y or DVDs that you purchased.

Answer :

Today at 2:14 AM

9c + 15d = 87
I don't know how to use the equation to answer it, but 4 DVDs were bought, and 3 CDs were bought.

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