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Suppose that the function f has the same average rate of change c between a...
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Mathematics, 14.03.2020 07:47 mithydizon1553
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Suppose that the function f has the same average rate of change c between any two points.
(a) Find the average rate of change of f between the points a and x to show that
c = f(x) β f(a)/ x-a
The rate of change between any two points is
Rearrange the equation in part (a) to show that
f(x) = cx + (f(a) β ca)
Multiplying the equation in part(a) by x β a, we obtain f(x) β f(a) = c()
Rearranging and adding
f(a) to both sides, we have f(x) = cx + f(a) β (), as desired.
How does this show that f is a linear function? What is the slope, and what is the y-intercept?
Because this equation is of form f(x) = Ax + B with constants A= and
B = f(a) β it represents a linear function with slope of and y-intercept f(a) β
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