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A company makes greeting cards and their research shows that that price and demand are related linearly:p=mx+b. They know that for every additional card they
A company makes greeting cards and their research shows that that price and demand are related linearly:p=mx+b.
They know that for every additional card they wish to sell they need to drop the price by $0.10. They also know that in order to sell 220 cards they need to set the price at $7. Find the linear equation relating price to demand.
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