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19 May, 17:33

1. Who is correct?

What is the rate

of change shown in

the table below?

x y

3 13.5

6 27

8 36

11 49.5

• Dylan says the rate of

change is 4.5.

• Rachel says the rate of

change is 13.5.

Who is correct, and why?

+4
Answers (2)
  1. 19 May, 18:48
    0
    (3,13.5) (6,27)

    slope = (27 - 13.5) / (6 - 3) = 13.5 / 3 = 4.5

    so Dylan is correct ... Rachel forgot to divide by 3
  2. 19 May, 19:06
    0
    Dylan is correct 4.5
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