# Linear Equations Project: Graphing Grass

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This hands-on graphing project has students measuring, collecting data, plotting points to make scatter plots, analyzing correlation, interpolating, extrapolating, finding slope and building line of fit equations as they grow and care for their cups of grass over the course of 20 days. Piecewise functions can also be built in if students give their grass a haircut!

Students will run into your room and over to their grass cups, excited to collect the day's data. Without knowing it, they naturally learn key topics of Algebra in the process.

This bundle includes the following files (all editable):

Graphing grass project.xls – This workbook includes the following worksheets, each in a separate tab: 1: rough draft graph for students to collect daily growth data, 2: weekly extrapolation checks, 3: essay template, 4: summary essay with word bank, 5: final product page, 6: grading rubric.

Let’s Graph Some Grass.ppt – This PowerPoint starts the unit, giving a broad overview of the steps involved in the project. A good place to start.

Graphing Grass Start Sheet.doc – This sheet introduces the project to the students. It includes directions for planting and graphing. It also outlines the project’s expectations and grading.

Linear Interpolation.ppt – This PowerPoint is meant to be shown after Day 8 of the project. It explains linear interpolation and asks students to interpolate a missing data point (from a weekend). It also hints at the extrapolation the students will be doing in the future (no pun!).

Correlation activity.doc – In this activity, students are given 4 scatter plots and are asked to determine if there is positive, negative or no correlation between the data points. Students are then asked to pick two points, draw a line of fit and find the equation of the line they drew. Lastly, students are asked to extrapolate to Day 30 using their line of fit equations.

Interpolation and extrapolation.doc – This sheet, given after all growth data has been collected and the line of fit equation has been found, asks students to interpolate any missing data points and extrapolate to day 30.

Scatter Plots and Lines of Fit.ppt – This PowerPoint is meant to be shown after the last day of data collection when students will need to create a line of fit for their grass data. The slide show introduces positive, negative and no correlation and includes an activity to plot data points, find a line of fit, and extrapolate to a later year.

Scatter Plots and Lines of Fit.doc – This document is meant to accompany the same-named .ppt file.

Finding line of fit for grass data.doc – After students have completed collecting their grass growth data they will need to draw an appropriate line of fit and find the line’s equation. This file shows an example of what a student’s work may look like.

Topics to be included in your final essay.doc – This sheet is a checklist of points students should include in their final essays about the project.

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Total Pages
30 pages
N/A
Teaching Duration
1 month
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