Equations for Lines of Fit

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

About how many male math teachers were there in 2006?

• 15
• 30
• 35
• 45

What type of correlation does this scatter plot show?

• positive 
• negative
• no correlation
• nonlinear association

What is the type of correlation?

• Negative 
• no correlation
• positive 

What type of association does this graph have?

• positive
• negative
• none
• all of the above

The equation of the trend line is y= 1/2x +1

How many laps can a bicycle make around the park in 23 minutes? (HINT: Since minutes is our y-variable and the graph doesn't go that far up, plug 23 into the equation above. Since 23 is the y-axis, substitute y with 23 instead. Then, solve.)

• 44 laps

• 12 1/2 laps

• 23 laps

What is the equation of the line of best fit?

• y = -25x + 170

• y = -5/8x + 170

• y = 25x + 170

• y = 5/8x + 170

Use the line of best fit to approximate rate of change relative to the scatter plot above.

• 7/5

• 5/7

• -7/5

• -5/7

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

• Graph A

• Graph B

• Graph C

• Graph D

What is the line of best fit?

• y = 5/3x + 375
• y = 1/3x + 475
• y = 5/3x + 3
• y = 1/3x + 375