Having now familiarized students with the y=mx+b form and reminding the students to think covariationaly, Ms. Coombs introduces a problem to serve as a point of ongoing discussion to develop another form for linear functions – one that allows for finding an equation when given a point and a rate of change. The problem states that Ms. Coombs checked her watch 7 minutes ago when she was 3.8 miles from home. She also knows she is traveling at ½ mile per minute. In this clip Ms. Coombs asks the students to model this on a graph. One student volunteers to provide the graph.

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