Finding Slope from a Scatter Plot

The scatter plot shows the price, in cents, of a postage stamp used to mail a letter in the United States for the years from 1958 to 2014. Also shown is a line of fit to model the data.

The equation of the line of fit is y=0.86x−0.71 , where y represents the predicted price, in cents, of a stamp and  y represents the number of years since 1958.

What statement best describes the model?

• The model estimates an increase, on average, of 0.71 cent per year in the price of stamp.
  

• The model estimates a decrease, on average, of 0.71 cent per year in the price of stamp.

• The model estimates a increase, on average, of 0.86 cent per year in the price of stamp.

• The model estimates a decrease, on average, of 0.86 cent per year in the price of stamp.

Tags

CCSS.HSF.LE.B.5

The equation for the line of best fit for this data is y = 61.93x - 1.79. According to the model, the slope can be interpreted as:

• After 0 hours of driving, they went 61.93 miles.

• They drove at a speed of 61.93 miles per hour.

• They drove 61.93 miles total.

• They drove 61.93 hours total.

Tags

CCSS.HSF.LE.B.5

Which of the following could be a possible line of best fit for the data?

• y = -5/2x + 20

• y = -x + 19

• y = x + 20

• y = 2/3x + 15 

Create a scatter plot of the data set. Then find the equation of the Line of Best Fit.

• y = 0.892x - 1.82

• y = 1.82x - 5.02

• y = 0.796x + 5.02

• y = 1.82x + 5.02

Tags

CCSS.8.EE.B.5

A group of hikers is descending, and the elevation of several of the hikers after a certain number of minutes is shown in the scatter plot.

True or False:

The group of hikers descends about 250 feet every minute.

Hint: What's the unit rate, slope?

• True

• False

Tags

CCSS.HSF.LE.B.5

the slope is -5/7, what does that mean?

• gain 5 hour of sleep for 7 cups of coffee

• lose 5 hours of sleep for 7 cups of coffee

• lose 7 cups of coffee for 5 hours of sleep

• lose 5 cups of coffee for 7 hours of sleep

Tags

CCSS.HSF.LE.B.5

What is the slope?

• 2/3

• 3/2

• -7

• -5

Tags

CCSS.8.EE.B.5

What is the slope of the table?

• 1/2

• 2

• -2

• 3

Tags

CCSS.8.EE.B.5

Find the slope of the line. 

• -1

• 1

• 1/2

• -1/2

Tags

CCSS.8.EE.B.5

Find the slope of  the line. 

• 3

• 1/3

• -1/3

• -3

Tags

CCSS.8.EE.B.5