Solve clearly

1. You have three observations. Each of them are given as coordinates on the (x,y) plain. These coordinates are (2,8), (4,7) and (6,1). a. Calculate the slope and intercept of the simple linear regression line between these two variables y and x. (10) b. Calculate the goodness of fit. (10) c. Calculate the slope and the intercept of the naive estimator as well