and the number of hours you spend studying. It also says that study time is twice as important (0.50) as either

combined_SAT score (0.25) or class_attendance (0.25). If this relationship is true, how could you raise your

GPA? By not skipping class and studying more. Note that you cannot do anything about your SAT score, since if

you are in college, you have (presumably) already taken the SATs.

Of course, economic models express relationships using economic variables, like Budget =
502 A • The Use of Mathematics in Principles of Economics

money_spent_on_econ_books + money_spent_on_music, assuming that the only things you buy are

economics books and music.

Most of the relationships we use in this course are expressed as linear equations of the form:

Expressing Equations Graphically

Graphs are useful for two purposes. The first is to express equations visually, and the second is to display

statistics or data. This section will discuss expressing equations visually.
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