Chris is hired by an accounting firm at a salary of $\$60,000$ per year. Three years later his annual salary has increased to $\$70,000$. Assume that his salary increases linearly.
a.) Find an equation that relates his annual salary $s$ and the number of years $t$ that he has worked for the firm.
$
\begin{equation}
\begin{aligned}
s &= \left( \frac{70,500-60,000}{3} \right)t + 60,000\\
\\
s &= 3500 t + 60,000
\end{aligned}
\end{equation}
$
b.) What do the slope and the $s$-intercept of his salary equation represent?
The slope 3500 represents the annual increase of Chris salary and the $s$-intercept is the salary offered to Chris for the first year.
c.) What will his salary be after 12 years with the firm?
$
\begin{equation}
\begin{aligned}
\text{when } t &= 12\\
\\
s &= 3500(12) + 60,000\\
\\
s &= 102,000
\end{aligned}
\end{equation}
$
After 12 years, Chris salary will be $\$102,000$
Friday, January 22, 2016
College Algebra, Chapter 2, Review Exercises, Section Review Exercises, Problem 54
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