Page 195 - IM_Grade 8_FL Print Sample.pdf

3.3 Synthesis: Coat Sales
Card 19 of 26
Let's invite a few classmates to share their work.
When discussing functions, what is a point of the form called? What about a point of the form ?
Teaching notes
In a scatter plot is there a -intercept?
When the average monthly temperature goes up, what seems to be happening to sales?
Pacing: 15 minutes for entire activity
This entire activity spans 6 cards. This is card 6 of 6. Activity Synthesis
The purpose of the discussion is for students to understand that each point in the graph represents a single month in which two measurements are made. Select students to share their responses, including
those identi ed for the last problem.
Consider asking some of the following questions:
“When discussing functions, what is a point of the form called? What about a point of the form ?” (The -intercept. The -intercept.)
“In a scatter plot is there a -intercept?” (It depends on the context. For some situations, it may not make sense for the variable represented along the -axis to be zero. For example if the variable is the height of a building. On other situations, there may be more than one point along the -axis. For example, in a situation like the one in the task, there may be multiple months where the average temperature is 0 degree Celsius.)
“When the average monthly temperature goes up, what seems to be happening to sales?” (They are decreasing.)
Lesson Synthesis
Card 20 of 26
Teaching notes
Lesson Synthesis