The puppy was weighed again at \(9\) months old and weighed \(52\) po…

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The scatterplot shows data set A, which consists of the weights

y

, in pounds, of a Labrador retriever puppy at various ages,

x

, in months. The equation of a line of best fit for the relationship in data set A can be written as

y = - 5.0 + 8.7 x

, where

2 \leq x \leq 6

The puppy was weighed again at

9

months old and weighed

52

pounds. Data set B consists of all the data points in data set A as well as the data point

(9, 52)

. The equation of a line of best fit for data set B can be written as

y = r + s x

, where

r

and

s

are constants and

2 \leq x \leq 9

. Assuming the equations of the lines of best fit are calculated in the same way, which of the following is the best estimate for the value of

s

5.8

8.7

13.7

17.7