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Write a system of two equations in two unknowns

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Write a system of two equations in two unknowns for each problem. Solve each system by substitution.

Free market. The equations S=5000+200x and D=9500-100x express the supply S and the demand D, respectively, for a popular compact disc brand in terms of its price x (in dollars). What happens to the supply as the price increases? (Include Graph)

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(a) As the price increases, the supply also increases.

(b) The graph ...

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