Lakeisha folded a napkin for each guest coming to a wedding reception. She recorded how long it took her to fold the napkins. She then graphed the relationship between the number of napkins she had folded and the average folding time per napkin (in seconds). Finally, Lakeisha drew a line of best fit on her graph. Both Lakeisha's graph and the line of best fit are shown in the figure. Use the two labeled point to write an equation for the line of best fit.