Linear Models to Make Predictions

The scatter plot shows the relationship between the number of chapters and the total number of pages for several books.  Use the trend line to predict how many chapters would be in a book with 180 pages. 

• 12 chapters
• 15 chapters
• 18 chapters
• 21 chapters

Find the slope for the trend line using points (2,2) and (4,3)

• 2
• 1/2
• -2
• -1/2

Which scatter plot shows a linear relationship between x and y?

• Graph A
• Graph B
• Graph C
• Graph D

• 440 turtles
• 40 turtles
• 150 turtles
• 90 turtles

What is a line of best fit used for?

• To make predictions
• To make the graph look pretty
• To connect the points
• To make it look like you know what you are doing

The scatter plot shows the relationship between the number of chapters and the total number of pages for several books. Use the trend line to predict how many pages would be in a book with 6 chapters. 

• ≅100 pages
• ≅170 pages
• ≅60 pages
• ≅20 pages

• y= 8/7x+1
• y= 7/8x+1
• y= -7/8 +1
• y= -8/7+1