Eyeballing the line of best fit
Estimating the line of best fit is a free educational video by Khan Academy.It helps students in grades 8 practice the following standards 8.SP.A.2.
1. 8.SP.A.2 : Know that straight lines are widely used to model relationships between two quantitative variables. For scatter plots that suggest a linear association, informally fit a straight line, and informally assess the model fit by judging the closeness of the data points to the line..