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What is the system of equations to be used in the following problem?

A food truck sells salads for $6.50 each and drinks for $2.00 each. The food truck's revenue from selling a total of 209 salads and drinks in one day was $836.50. How many salads were sold that day?
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1 Answer

6.50S+2.00D=836.50
S+D=209