After going through the two main solution methods for the photo enlargement problem, the teacher asks the students how they can generalize.
Definition of Proportionality, Photo Enlargement Problem, Clip 1, 4:05
This is an example of how the photo enlargement problem can be introduced in the classroom. Notice teacher has them recall covariation defn first, then asks about proportionality.
As he hands out the worksheet, he gives them motivation for why they are doing such an activity. This helps make it real for the students, something they can see as useful.
