# Algebraic Expressions Lesson 4 Episode 5 (Teachers)

### Exploring

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Haleemah and ET generalize their method and write an algebra equation that relates the scooter’s velocity and its end location.

### Episode Supports

Focus Questions

For use in a classroom, pause the video and ask these questions:

1. [Pause the video at 1:31] ET and Haleemah are asked to generalize their method. Before watching them create an equation that relates the four quantities (a trip time of 3 seconds, a starting location of 4 meters, and unknown velocity and end location), encourage your students to try to generalize their method.
2. [Pause the video at 2:44] ET and Haleemah are generalizing Hector’s end location when he starts at 4 meters, rides for 3 seconds, and has a velocity of v meters per second. ET writes 3v for the end location. Haleemah says she thinks it should be 3v + 4. Ask your students to discuss who is correct and encourage them to justify their reasoning.

Supporting Dialogue

Ask your students to consider the equation Haleemah and ET have written: 3v + 4 = L. Ask them to think about what kind of values L could be. Can L be positive or negative? Can L be zero? Ask them to explain their reasoning whenever they provide a response.