Describe how you can make the line of best fit. Write the approximate slope and y-intercept of the line of best fit. Show your work.

So, I know how to make a line of best fit-- how do I write the y-intercept or slope of it, though? Please, please help.

The coordinate (tell me if picture link doesn't work) : file://localhost/Users/kylebryant/Desktop/Screen%20shot%202016-04-15%20at%2012.00.41%20AM.png