\"\"

\

Each CD is an average of \"\" long, the linear function \"\".

\

Find the how many CD\"\"s to need to bring.

\

a.

\

They have \"\" CD\"\"s.

\

Find how many hours of music is that.

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\"\"                    (Original equation)

\

\"\"                  (Substitute \"\")

\

\"\"                            (Multiply)

\

Therefore, \"\" CD\"\"s have \"\" hours of music.

\

\"\"

\

b.

\

The trip they are taking is \"\".

\

Find how many CD\"\"s should bring.

\

\"\"                    (Original equation)

\

\"\"                       (Substitute \"\")

\

\"\"               (Divide each side by \"\")

\

\"\"                                  (Cancel common terms) 

\

The number of CD\"\"s needed for a \"\" trip is \"\".

\

\"\"

\

a. \"\" CD\"\"s have \"\" hours of music.

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b. The number of CD\"\"s needed for a \"\" trip is \"\".