8th grade Use the fit line's equation to predict, and say what its slope and intercept mean worksheet

Use the fit line's equation to predict, and say what its slope and intercept mean

Grade 8 Math Worksheet - Building Confidence

Circle the best answer, or write your answer on the line.

1. 1.

   Luz's garden club fit a line to seedling heights. About how tall does the model say a seedling is 9 days after it is moved outside, in cm?
2. 2.

   Milo fit a line to bike rides: length against time. The helmet is shiny and new. About how many minutes does the model predict for a 7-kilometer ride?
3. 3.

   Noah's jump-rope club fit a line to weeks of practice and jumps in one minute. About how many jumps does the model predict after 7 weeks?
4. 4.

   Pia's class drew a fit line on the bean plant plot. Using the line, about how tall is a plant 5 weeks after planting, in cm?
5. 5.

   Ren's team drew a fit line for practice and free throws. Using the line, about how many free throws go with 7 hours of practice?
6. 6.

   Tala drew a fit line through a plot of short walks. Using the line, about how many blocks go with 8 minutes of walking?
7. 7.

   Ari's class fit the line y = 4x + 30 to practice time (x, in hours a week) and quiz scores (y). What does the 4 mean?

   • The 4 means every extra hour raises every student's score by exactly 4 points, with no exceptions.
   • The 4 means each student practiced about 4 hours a week.
   • The 4 means students who practice 1 more hour a week tend to score about 4 points higher.
   • The 4 means a student who does not practice tends to score about 4 points.
8. 8.

   Bo's garden club fit the line y = 1.5x + 4 to days outside (x) and seedling height in cm (y). What does the 1.5 mean?

   • The 1.5 means a seedling tends to be about 1.5 cm tall on its first day outside.
   • The 1.5 means every seedling grows exactly 1.5 cm each day.
   • The 1.5 means seedlings outside 1 more day tend to be about 1.5 cm taller.
   • The 1.5 means the club measured 1.5 seedlings each day.
9. 9.

   Esme fit the line y = 3x + 5 to bike rides: length in km (x) and time in minutes (y). The tires were freshly pumped. What does the 3 mean?

   • The 3 means the rides were about 3 kilometers long.
   • The 3 means rides that are 1 km longer tend to take about 3 more minutes.
   • The 3 means a ride tends to take about 3 minutes before it even starts.
   • The 3 means every kilometer takes exactly 3 minutes on every ride, without any variation.
10. 10.

    Jun's class fit the line y = 6x + 15 to shoe length (x) and height (y), both in cm. What does the 6 mean?

    • The 6 means every centimeter of shoe makes a person exactly 6 cm taller.
    • The 6 means the class measured 6 shoes.
    • The 6 means people whose shoes are 1 cm longer tend to be about 6 cm taller.
    • The 6 means a person tends to be about 6 cm tall with no shoes.