9th grade algebra word problem. please help?

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It says a vendor is selling lemonade at a game. A large cup costs $1.50, and a small cup costs $1.30. What equation would you use to show the total amount of money that the vendor makes?
---I think it's y=$1.30x+$1.50x. But I'm not sure.

And then there's a second part to the problem that says: How many cups of each size does the vendor have to sell in order to make $39.00.
---I don't know how to figure that out.

Please help. Thanks. :)
 
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