PhET/C2/Graphing-Lines/English

Visual Cue	Narration
Slide Number 1 Title Slide	Welcome to this tutorial on Graphing Lines simulation.
Slide Number 2 Learning Objectives Demonstrate an interactive PhET simulation, Graphing Lines	In this tutorial, we will demonstrate, Graphing Lines, an interactive PhET simulation.
Slide Number 3 Pre-requisites	To follow this tutorial, Learner should be familiar with topics in high school mathematics.
Slide Number 4 System Requirements Ubuntu Linux OS version 14.04 Java version 1.7.0 Firefox Web Browser 53. 02.2	Here I am using, Ubuntu Linux OS version 14.04 Java version 1.7 Firefox Web Browser version 53.02.2
Slide Number 5 Learning Goals	Using this simulation we will learn, About Cartesian coordinate system How to calculate the slope of a graphed line To save the plotted lines How to change the slope and intercept of the line How, changing variables in a linear equation will affect the line.
Slide Number 6 Linear Equation y=mx+b point to m and b.	An equation with two variables x and y is a Linear equation. y=mx+b Here m is slope of the line and b is intercept. Slope signifies rate of change of y value with respect to x value. y-intercept is y value when x=0
	Let us begin the demonstration.
Slide Number 7 Link for PhET simulation http://phet.colorado.edu	Use the given link to download the simulation.
Point to the file in Downloads folder.	I have already downloaded Graphing Lines simulation to my Downloads folder.
Right click on graphing-lines_en.html file. Select Open With Firefox Web Browser option. Point to the browser address.	To open the simulation, right click on graphing-lines_en.html file. Select the option, Open With Firefox Web Browser. File opens in the browser.
Cursor on the interface.	This is the interface of Graphing Lines simulation.
Point to each screen.	The interface has four screens, Slope Slope-Intercept Point-Slope and Line Game.
Click on Slope screen.	Click on Slope screen.
Point to the graph.	Screen has a Cartesian coordinate system with x and y axes.
Point to the formula box point to the input buttons. Point to the default values. Point to the graph and slope.	On the right side, formula box shows formula to find slope of the line. To calculate the slope, we can input values for y2, y1 and x2, x1. Default values of y2, y1 are 4 and 2. And x2, x1 are 3 and 1. A graph is plotted using the default values. Here we can see, Slope is 1.
Point to the buttons.	We can change the values of y2, y1 and x2, x1 using up and down arrow buttons.
Point to the Save Line option point to Erase Lines option. Click on the red minus sign. Click on green plus button.	Plotted line can be saved using Save Line button. We can hide the formula box, by clicking on red minus sign. To show the box click on green plus button.
Point to Slope, Hide lines, Hide grid check boxes.	Below the formula box, we have Slope, Hide lines and Hide grid check boxes.
Point to the check boxes. Uncheck, Hide lines and Hide grid check boxes	If we click on, Hide lines and Hide grid check boxes, graph and grid are hidden. Automatically, Slope check box is disabled. Let's uncheck Hide lines and Hide grid check boxes to enable Slope check box.
Point to the Graph and slope. Point to purple and yellow points on the line. Click and drag them on the line.	Notice that Graph displays value of the slope. Observe that on moving purple and yellow points, x1, y1 and x2, y2 values can be changed. As we move the points, slope of the line changes. Observe the change in values of x and y in the formula box.
Point to the Point tools (gray boxes displaying point co-ordinates). Drag and place the Point tools on purple and yellow points. Point to the coordinates.	At the bottom of the screen, we have gray boxes to display coordinates of a point. These gray boxes are called as Point tools. Drag and place Point tools on purple and yellow points to see the coordinates. Drag the Point tools to the bottom.
Drag the points. Point to slope.	Drag the purple point to coincide with origin (0, 0). Drag one of the Point tool and place it on the origin. Drag yellow point to coincide with (5,5). Observe that slope of the line is 1.
Click on Save Line button.	Click on Save Line button in the formula box. Line is saved.
Drag the yellow point to (2,8). Drag the point tool and place it on yellow point.	Drag the yellow point to (2,8). Drag the point tool and place it on yellow point. This confirms that yellow point is at(2,8). Now Slope is 4.
Click on Save Line in right panel.	Click on Save Line in the formula box. Line is saved.
Drag the yellow point to (-5,5). Drag the point tool.	Drag the yellow point to (-5,5). Drag and place Point tool on yellow point. Now Slope is -1.
Click on Save Line in right panel.	Click on Save Line in the formula box. Line is saved.
Drag the yellow point to (-2,8) x=-2, y=8 Point to the slope.	Drag the point tool back to place. Drag the yellow point to (-2,8). Here Sope is -4.
Click Save Line.	Click on Save Line. Line is saved
Notice the 6 lines in graph, on left panel.	We have drawn 4 lines with different slopes. Notice that steepness is related to slope.
Slide Number 8 Assignment	As an assignment, Find when slope is zero and when it is undefined. Give an explanation.
Point to Slope-Intercept screen. Click on Slope-Intercept screen.	Now let us explore Slope-Intercept screen at the bottom of the interface. Click on Slope-Intercept screen. Screen opens with a line y= 2/3x+1. Here intercept value is 1.
Point to m and b.	In this screen we can change the values of 'm' and 'b'.
Drag the purple point on the line. Point to the intercept.	Drag the purple point on y axis. Notice that purple point represents the intercept. When we move the purple point, intercept for the line changes.
Move the blue point on the line. Point to the blue point.	The blue point is free to move across the graph. When we move the blue point, slope of the line changes.
Click on Reset button. Click on Save Line	Click on Reset button to reset the simulation. Click on Save Line. Line is saved.
Change the value to 3. Drag the Point tool to the blue point. Point to the intercept.	Change the numerator value of m from 2 to 3 in the formula box. Notice that slope is 1 while Intercept still remains 1.
Point the line. Point to the intercept. Click on Save Line	Now adjust m again to 2/3 and increase b value to 4. Notice that, the new line is parallel to the first line but intercepts y-axis at 4. Click on Save Line. Line is saved.
Point to the line. Click on Save Line in the formula box. Point to 3 parallel lines with different points.	Change b value to -2 Click on Save Line. Line is saved. We have 3 parallel lines intercepting y axis at 3 different points.
Click on Reset button.	Click on Reset button to reset the simulation.
Point to b value. Point to the line. Point to the origin. Click on y=x and y=-x check boxes. Point to the lines.	Let us change b value to zero. Notice that purple point is at the origin. Line now passes through the origin. Click on y=x and y=-x check boxes below the slope. Notice that we have three lines passing through the origin.
Point to Point-Slope screen.	Let us now move on to Point-Slope screen.
Click on Point-Slope at the bottom of the screen.	Click on Point-Slope at the bottom of the interface. In Point-Slope screen, a set of (x,y) values are substituted in the equation. In this method, x and y values are defined.
point to the formula box. Point to purple point and drag the point tool to see co-ordinates.	For a given value of (x, y), m can be calculated using the formula, y-y1 = m(x-x1) the Generic point (x1,y1) is represented by the purple point. Drag the Point tool to the purple point to see the coordinates. Drag the Point tool back to its place.
Demonstrate moving line. Point the red cross mark in the formula box.	Drag the purple and blue points freely across the graph to modify the equation of the line. Drag and place purple point to (5,0). Then drag the blue point to (5,5).
Point to y-axis and slope. Click on Save line.	Notice that line is parallel to y-axis and slope is undefined. Click on Save line. Line is saved. Drag the purple point along the x-axis. Notice that Slope is undefined all along the x-axis.
	Now let us move on to Game screen.
Go to Line Game tab	Click on Line Game screen. Line Game screen has 6 difficulty levels, to play. These games will test the knowledge gained using this simulation. It has a Timer and Sound buttons at the bottom of the screen. Click on each game and explore.
Slide Number 8 Summary	Lets summarize. In this tutorial, we have learnt, About Graphing Lines, an interactive PhET simulation.
Slide Number 9 Summary	Using this simulation, we have learnt, About Cartesian coordinate system with x and y axes. How to calculate the slope of a graphed line. To save the plotted lines How to change the slope and intercept of the line How changing variables in a linear equation will affect the line.
Slide Number 10	As an assignment 1. Using Slope-Intercept screen, find when the value of slope is 1. 2. Using Point-Slope screen, find in which quadrants slope is positive.
Slide Number 11 About the Spoken Tutorial Project	The video at the following link summarizes the Spoken Tutorial project. Please download and watch it.
Slide Number 12 Spoken Tutorial workshops	The Spoken Tutorial Project team: conducts workshops using spoken tutorials and gives certificates on passing online tests. For more details, please write to us.
Slide Number 13 Forum for specific questions: Do you have questions in THIS Spoken Tutorial? Please visit this site Choose the minute and second where you have the question Explain your question briefly Someone from our team will answer them	Please post your timed queries in this forum.
Slide Number 14 Acknowledgement	This project is partially funded by Pandit Madan Malaviya National Mission on Teachers and Teaching.
Slide Number 15 Acknowledgement	Spoken Tutorial Project is funded by NMEICT, MHRD, Government of India. More information on this mission is available at this link.
	This tutorial is contributed by Spoken tutorial team IIT Bombay. Thank you for joining.

Contributors and Content Editors

Madhurig