Question

Geoffrey read 15 books in 21 weeks. The diagram shown can be used to track his progress. If Geoffrey read at the same rate each​ week, how many books had Geoffrey read in 7 ​weeks? In 14 ​weeks? Complete the diagram.
font size increased by 2 0font size increased by 2 7font size increased by 2 14font size increased by 2 21font size increased by 2 0font size increased by 8 Weeksfont size increased by 8 Books Readfont size increased by 2 15



x y graph
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Part 1
Which of these show the completed​ diagram?

Answer 1

Geoffrey reads at a rate of 15/21 = 5/7 books per week.

- In 7 weeks: 7*(5/7) = 5 books.
- In 14 weeks: 14*(5/7) = 10 books.

The completed diagram has the points (Weeks, Books) (0,0), (7,5), (14,10), (21,15) (on the straight line y = (5/7)x).