The two points on the graph are given by the linear function f. a. Use the two points to find the equation that represents the linear function f. b. What is f(6)? -1 1 2 3 4 5 -1 1 2 3 x y x y graph a. The equation enter your response here represents the linear function f. (Simplify your answer. Type an equation using x and y as the variables. Use integers or fractions for any numbers in the equation.)