The equation of the linear regression line represents the relationship between the number of years since 2000, x, and the average cost of tuition at a four-year college, y. what does the slope of the line represent? yˆ = 938x + 12,765 for every year since 2000, the cost of tuition increased by $12,765 for every year since 2000, the cost of tuition decreased by $938 for every year since 2000, the cost of tuition increased by $938 the cost of tuition in the year 2000 was $938