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====== Pizza & Cola ======

===== Prompt =====

** "Which of the graphs below..." **

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===== Context =====

This [[strategy:smallwhiteboard:|SWBQ]] provides an easy introduction to the
graphical representation of functions of several variables.

===== Wrap Up =====

In each case, a brief discussion consists of asking for a student volunteer 
to describe how the shape of each graph is related to the corresponding prompt.  
Common answers typically analyze where the graphs are increasing or decreasing 
separately in the pizza and cola directions.

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//This question is taken from **Calculus**, 4th edition, by Hughes Hallett et
al, (cc) 2005 by John Wiley & Sons, Inc, and is used by permission.//