Question

The graph below shows the height through which an elevator travels, y, in x seconds:

Answer 1

Answer:

• D. 15

Step-by-step explanation:

Rate of change is:

• The change in the height over change in time
• m = (y2 - y1) / (x2 - x1)

Substitute values with ordered pairs:

• m = (60 - 15)/(4 - 1)
• m = 45/3
• m = 15

Correct option is D. 15

Answer 2

Answer:

A line is shown passing through the ordered pairs (1, 15) and (2, 30) and (3, 45) and (4, 60).

The rate of change of height :---

$slope( = m) = \frac{(60 - 15)}{(4 - 1)} = \frac{45}{3} = 15$

D. 15 is the right answer.