Over the years, Americans have continued their fascination with Hollywood and the
movies. In 2009, the number of tickets sold at domestic movie theaters topped
1.4 billion, with a total gross of almost $10.6 billion. The top box office draws of
that year—Avatarand Transformers 2: Revenge of the Fallen—attracted millions
of adults and children wishing to get away from it all for a few hours. (Source:
http://www.boxofficemojo.com)
In Exercises 13 and 14of Section 4.4,we use systems of equationsto find out
how much money these and other top films earned in 2009.
Systems of Linear Equations
and Inequalities
4.1 Solving Systems of Linear Equations by Graphing
Linear Equations by
Graphing
4.2 Solving Systems of Linear Equations by Substitution
Linear Equations by
Substitution
4.3 Solving Systems of Linear Equations by Elimination
Linear Equations by
Elimination
Summary Exercises on
4.4 Applications of Linear Systems
Equations
4.4 Applications of
Linear Systems
4.5 Solving Systems of
Linear Inequalities
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CHAPTER