Question

What is the average rate of change for ƒ(x) = −2x + 70 over the interval 2 ≤ x ≤ 6?

Answer 1

- 2

Explanation:

Since the function is linear then the average rate of change is the measure of the slope of the line.

The equation of a line in slope- intercept form is

y = mx + c ( m is the slope and c the y- intercept )

y = - 2x + 70 ← is in slope- intercept form

with slope m = - 2

Thus rate of change is - 2