A scatter plot that represents the amount of miles that runners in a running club ran last week as well as their best mile time is shown below Graphed points: (19,7.4),(34,6.8),(38,6.2),(50,5.2) ,(56,5.7),(70,5.9),(78,4.4)

Malik wants to use the equation y=ax+b to represent a line of best fit for the data where x represents the amount of miles ran last week and y represents the best mile pace (in minutes). He wants to determine a line of best fit in order to estimate best mile paces for other runners.

Complete the table to determine which values should be used for a and b