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**Student Outcomes**

1. Students work with proportional relationships in terms of average speed and constant speed in order to write a linear equation in two variables.

2, Students use linear equations in two variables to answer questions about distance and time.

**Lesson Questions / Review**

- Average speed is found by taking the total distance traveled in a given time interval, divided by the time interval.

- If we assume the same average speed over any time interval, then we have constant speed, which can then be used to express a linear equation in two variables relating distance and time.

- We know how to use linear equations to answer questions about distance and time.

- We cannot assume that a problem can be solved using a proportion unless we know that the situation involves constant speed (or rate).

**Lesson Summary**

Module 4 - Lesson 10

Module 4 - Lesson 10