a. For f (x) = 3x + 2, find f (5) – f (4). Compare your result with the slope of the graph of f. b. For f (x) = 2x + 5, find f (7) – f (6). Compare your result with the slope of the graph of f.
c. For f (x) = 4x + 1, find f (3) – f (2). Compare your result with the slope of the graph of f.
d. What do the results that you found in parts (a), (b), and (c) suggest about a linear function of the form y = mx + b?