Step 1: Read the transcript of a selected section of the video

This activity focuses on the transcript of a selected section of the lesson you just viewed: the discussion of the graphs of the two equations.

As you read the transcript below, consider:

What do you notice about the vocabulary students use?
What do students seem to understand (or not understand) about slope?

Transcript

(2:48) Kirk:	Yesterday’s graph, as you recall—looked like this, didn’t it? Where would today’s graph—how would we graph that one? The same way? It’s on the same line?
Students:	No. It would be parallel, just three below though. Negative three. Zero, negative three.
Kirk:	It’s parallel to this, but we have—our intercept you said is it negative three? But they are parallel.
Angel:	The same slope just starts at a different point.
Kirk:	Okay. So the question is, how is yesterday’s equation similar to today’s? Angel just said they have the same slope.
Kirk:	Are there any other similarities between today’s graph and yesterday’s graph?
Students:	They have the same rise over run.
Kirk:	They have the same rise over run, which is slope.
Kirk:	Okay. They are parallel, someone said that. How are they different?
Students:	The intercepts. The y-intercepts.
Kirk:	The y-intercepts are different.
Student:	And like the slopes . . .
Kirk:	Slopes are the same, y-intercepts are different.
Student:	One’s traveling fast and the other’s traveling kinda slow.
Kirk:	Which one’s traveling kinda slow?
Student:	The blue one.
Angel:	No, they’re traveling at the same speed, it’s one starts behind.
Kirk:	He says they’re going the same speed. I say that one’s slow.
Angel:	They are. They are both going four over one. They’re just one—like in a race. He got a head start and she’s behind him by three.
Kirk:	Do you buy that? I mean, could we say that the growth rate, which is kind of like the speed of those dots growing, can we say that these two grow at the same rate?
Student:	Yeah, they grow at the same rate.

Step 2: Share your thoughts

If you are engaging in this module with others, we encourage you to share your thoughts with a colleague or in small groups and expand on the ideas of others.