In Problems 13–20, a linear function is given. (a) Determine the slope and y-intercept of each function. (b) Use the slope and y-intercept to graph the linear function. (c) Determine the average rate of change of each function. (d) Determine whether the linear function is increasing, decreasing, or constant. A 13. f(x) = 2x + 3 14. g(x) = 5x - 4 15. h(x) = -3x + 4 16. р (x) — -х +6 17. f(x) = - 3 18. h(x) = -x + 4 19. F(x) = 4 20. G(x) = -2

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