Line of Best Fit Interpreting

Layla recorded her baby sister’s height, y, in inches, each month, x. The scatterplot shows her results.

Layla modeled the data approximately with the linear function y = 0.75x + 15. What does the slope of the line represent?

• Her sister grew about 15 inches each month.

• Her sister grew about 1 inch every 15 months.

• Her sister grew about 0.75 inch each month.

• Her sister grew about 1 inch every 0.75 month.

 Neko loves to make cakes.  The following table shows how the number of eggs he has left changes as he makes cakes.
What is the meaning of the y-intercept?

• He uses 5 eggs for every 2 cakes.

• He started with 47 eggs.

• He uses 47 eggs for every 0 cakes.

• He started with 5 eggs.

The scatter plot below shows the number of books read by students in Mrs. Hall’s English class and their final grades. Which statement represents the best description about the line of best fit?

• The more books students read, the lower their English grade.

• The more books students read, the higher their English grade.

• The fewer books students read, the higher their English grade. 

• No relationship exists between the number of books students read and their English grades. 

• Every 8.47 years, the tree grows 1 foot.

• Every year, the tree grows 8.47 feet.

• Every 0.96 years, the tree grows 1 foot.

• Every year, the tree grows about 0.96 ft.

The red line represents the line of best fit for the scatter plot. How many ice cream sales are expected if the temperature is 90°?

• 55

• 0

• 103

• 100

• y = 1.45x + 22
• y = -2x + 15
• y = 1.33x + 30
• y = -1.5x + 24

What is the equation of the line of best fit?

• y= 6x + 2

• y = -2x +6

Based on the line of best fit for the scatter plot, which of the following amounts is closest to the cost of a 120-minute phone call?

• $10

• $12

• $15

• $20

The scatter plot below shows the number of books read by students in Mrs. Cates English class and their grades. Which statement represents the best description about the line of best fit?

• The more books students read, the lower their English grade.

• The more books students read, the higher their English grade.

• The fewer books students read, the higher their English grade.

• No relationship exists between the number of books students read and their English grades.

The scatter plot below shows the number of books read by students in Mrs. Hall’s English class and their final grades. Which statement represents the best description about the line of best fit?

• The more books students read, the lower their English grade.

• The more books students read, the higher their English grade.

• The fewer books students read, the higher their English grade. 

• No relationship exists between the number of books students read and their English grades.