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 + 8000,

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

- q = -40(35) + 8000 = 6600

games this year.

See the Topic Summary of Functions for more examples.|

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