Question

The scatter plot below shows the number of stamps Katie collected in different months:

What is the approximate predicted number of stamps she collected in the 25th month?

980
990
1000
1010

Answer 1

990 is the correct answer

Explanation:

The equation of the line of best fit is y = 40x − 10.

To approximate stamps collected in month 25, substitute 25 in for x.

Answer 2

Find rate of change=(y2-y1)/(x2-x1)
Rate of change=(70-30)/(2-1)=40

F (x)=40x
F (12)=40 (12)=980