A linear demand function expresses the demand q (for example annual sales) as a linear function of the unit price p. It has the form

- q = mp + b.

**Example** The annual sales of your computer game "Cyber Raptor" is given by

- q = -40p + 8,000,

where p is the price you charge per game. Thus, if you charge $35 per unit, you can expect to sell

- q = -40(35) + 8,000 = 6,600

games this year.

See the Topic Summary of Functions for more examples.

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