I graphed the sale of cell phones in America from 1984 to 1993. http://hypertextbook.com/facts/2002/BogusiaGrzywac.shtml

The regression equation I found was about y = 14.58x - 30.51

The correlation coefficient is .86

The data I used was on cell phone sales, and those have been increasing exponentially, so the data didn't fit the normal linear scatter plot, but it followed an exponential linear equation. This means that the line of best fit doesn't line up as well with the points as other scatter plots. It is important to be able to interpret graphs because a lot of data in the public is presented this way. Being able to find the line of best fit allows you to summarize all the information and see approximately what trend the data is following.