A. use the two points whose coordinates are shown (6,12) and (10,10) to find the point-slope form of the equation of the line that models the percentage of adults on diets, y, x years after 1987.

b. write the equation in part (a) in slope-intercept form. use function notation, where f(x) is the percentage of adults on diets x years after 1987.

c. use the linear function to predict the percentage of adults on weight-loss diets in 2007.