# Lesson 21: Variation

Topic(s):

The lesson begins with a comparison of data tables and graphs of two functions, one directly proportional (cost of gas) and the other exponential (population), before a definition for direct variation is introduced. Direct variation is then linked to linear function $f(x)= kx$ and the scaling property of direct variation is examined (i.e. a multiple of the independent variable will always correspond to that same multiple of the dependent variable). Direct variation with a power of $x$ follows with a test for direct variation before indirect variation and indirect variation with a power of $x$ are introduced.

Identifier:
http://www.curriki.org/xwiki/bin/view/Coll_Group_SanDiegoCommunityCollegesDevelopmentalMathExchange/Lesson21Variation?bc=;Coll_Group_SanDiegoCommunityCollegesDevelopmentalMathExchange.IntermediateAlgebra;Coll_Group_SanDiegoCommunityCollegesDevelopmentalMa
Rating:
Creator(s):
Bruce Yoshiwara (Pierce College) and Kathy Yoshiwara (Pierce College)
Cataloger:
Bohdan Rhodehamel
Publisher:
Developmental Mathematics Collection
Rights:
CC BY-NC-SA