The graph shows the percentage of a country s adults on weight loss diets L Percentage on Diets O A NON 24 20 16 12 8 4 0 8 10 10 20 Years after 1987 a Use the two points whose coordinates are shown to find the point slope form of the equation of the line that models the percentage of adults on diets y x years after 1 Simplify your answer Type your answer in point slope form Use integers or fractions for any numbers in the equation 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 f x Simplify your answer Type an expression using x as the variable Use integers or fractions for any numbers in the expression c Use the linear function to predict the percentage of adults on weight loss diets in 2007 10