I'm having trouble with part (b) of this problem, I attached an image below.

Suppose a: and y vary together and are related by a constant rate of change. The graph of y in terms of z is shown below. (The axes are to scale.) The graph of y in terms of m. The axes are to scale. A corresponding pair of changes in a: and y are illustrated. a. Use the graph to approximate the constant rate of change of y with respect to 2:, m. (Hint: Think about the meaning of constant rate of change and your answer should be a numerical value.) m=2 - b. When starting from any point on the graph of y in terms of :c, and given any Am change away from that point, what is the value of Ag (in terms of Am), to assure that the new point lies on the graph? Ay= :x syntaxm