📝 Interpreting Practice and Review

The graph shows the number of birds observed at a feeder each week. An equation for the line of fit is:

 $y=-4x+50$  
Interpret the slope.

• There were 4 birds at the birdfeeder in the beginning.

• There were 50 birds at the birdfeeder in the beginning.

• The amount of birds at the bird feeder decreases by 50 birds every week.

• The amount of birds at the bird feeder decreases by 4 birds every week.

The graph shows the number of birds observed at a feeder each week. An equation for the line of fit is:

 $y=-4x+50$  
Interpret the y-intercept.

• There were 4 birds at the birdfeeder in the beginning.

• There were 50 birds at the birdfeeder in the beginning.

• The amount of birds at the bird feeder decreases by 50 birds every week.

• The amount of birds at the bird feeder decreases by 4 birds every week.

The graph shows the number of members at a gym each month from January to July.  An equation for the line of fit is:

 $y\ =\ 5.9x+19$  
Interpret the y-intercept.

• There were roughly 6 members at the gym at the start.

• There were 19 members at the gym at the start.

• Gym membership increased by roughly 5.9 members every month.

• Gym membership increased by roughly 19 members every month.

The graph shows the number of members at a gym each month from January to July.  An equation for the line of fit is:

 $y\ =\ 5.9x+19$  
Interpret the slope.

• There were roughly 6 members at the gym at the start.

• There were 19 members at the gym at the start.

• Gym membership increased by roughly 5.9 members every month.

• Gym membership increased by roughly 19 members every month.

The graph shows the total inches of rain that had fallen after each hour.  An equation for the line of fit is:

 $y=0.6x$  
Interpret the slope.

• There was no rain in the beginning.

• There were 0.6 inches of rain in the beginning.

• The amount of rain fallen increased by 0.6 inches every hour.

• The amount of rain fallen increased by 0 inches every hour.

The graph shows the total inches of rain that had fallen after each hour.  An equation for the line of fit is:

 $y=0.6x$  
Interpret the y-intercept.

• There was no rain in the beginning.

• There were 0.6 inches of rain in the beginning.

• The amount of rain fallen increased by 0.6 inches every hour.

• The amount of rain fallen increased by 0 inches every hour.

The graph shows the number of birds observed at a feeder each week. An equation for the line of fit is:

 $y=-4x+50$  
Use the equation to predict the number of birds after 9 weeks.

• 14

• 15

• 16

• 17

The graph shows the total inches of rain that had fallen after each hour.  An equation for the line of fit is:

 $y=0.6x$  
Use the equation to predict the amount of rain after 12 hours.

• 7.0 inches

• 7.1 inches

• 7.2 inches

• 7.3 inches

The graph shows the number of members at a gym each month from January to July.  An equation for the line of fit is:

 $y\ =\ 5.9x+19$  
Use the equation to predict the number of gym members after 12 months.  

Note: In the real world, we would round this prediction to the nearest whole number.

• 89.8 members

• 90.1 members

• 90.3 members

• 90.5 members

Find the equation of the line of fit for the scatter plot.

• y = 5/6 x + 1

• y = x + 5/6

• y = x + 1

• y = 6/5 x + 1