Questions: A line of best fit is f(x)=-0.86 x+13.5 for the set of points in the table. x f(x) 2 12 3 10 5 10 6 8 7 9 8 5 9 6 Using the equation for the line of best fit, what is a good approximation for the value of the function, f(x), when x= 18 ? -5 -2 3 12

Transcript text: 47:02 A line of best fit is $f(x)=-0.86 x+13.5$ for the set of points in the table. \begin{tabular}{|c|c|} \hline $\boldsymbol{x}$ & $\boldsymbol{f} \boldsymbol{x} \boldsymbol{)}$ \\ \hline 2 & 12 \\ \hline 3 & 10 \\ \hline 5 & 10 \\ \hline 6 & 8 \\ \hline 7 & 9 \\ \hline 8 & 5 \\ \hline 9 & 6 \\ \hline \end{tabular} Using the equation for the line of best fit, what is a good approximation for the value of the function, $f(x)$, when $x=$ 18 ? $-5$ $-2$ 3 12