Line of Best Fit by Eye
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The table shows the weekly sales(million $) of a CD and the number of weeks since its release.
\begin{array}{|l|l|l|l|l|l|l|l|l|}
\hline \text { week } & 1 & 2 & 3 & 4 & 5 & 6 & 7 & 8 \\
\hline \text { sales(\$) } & 19 & 15 & 13 & 11 & 10 & 8 & 7 & 5 \\
\hline
\end{array}
a) What is the equation of the line of best fit, given that it passes through the points \((5,10)\) and \((6,8)\)?
b) What will be the sales in 9th week?
c) At what week there will be no sales at all?
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