The data show Mark’s commute times, in minutes, based on how many minutes after 7:00 A.M.

Question

The data show Mark’s commute times, in minutes, based on how many minutes after 7:00 A.M. he leaves his home. Use the points (1, 24) and (15, 17) to write an equation for the line of fit in slope-intercept form, where x is the number of minutes after 7:00 A.M. and y is the commute time, in minutes. If the trend continues, what would be the approximate commute time if Mark leaves at 7:18 A.M.?

Minutes after 7:00 A.M.

1

2

4

4

6

8

10

12

14

15

Commute

Time (min)

24

22

24

20

22

19

22

19

15

17

The line of best fit is y = 

If the trend continues, the approximate commute time if Mark leaves at 7:18 A.M. is [blank]   minutes.

Answer 1

Start with two-point form

(y - 24) / (x - 1) = (17 - 24) / 15 - 1)