Astudy was conducted on the age of a car and its mileage. after using the averaging method for the line of best fit, the two representative points found were (5, 60,000) and (10, 100,000). what is true about the line of best fit for this data? select all that apply. the estimated slope is 8,000. the y-intercept is 8,000. the equation for the line of best fit of this data is y = 8,000 x + 20,000. the equation for the line of best fit of this data is y = 20,000 x + 8,000. the estimated slope is 20,000.