8th GradeLinear relationshipsabout 3 minCCSS 8.EE.B.5Graph proportional relationships, interpreting the unit rate as the slope of the graph. Compare two different proportional relationships represented in different ways.CCSS 8.F.B.4Construct a function to model a linear relationship between two quantities. Determine the rate of change and initial value of the function from a description of a relationship or from two (x, y) values, including reading these from a table or from a graph. Interpret the rate of change and initial value of a linear function in terms of the situation it models, and in terms of its graph or a table of values.+0
Race an earthquake to towns near and far, and see how much warning each one gets.
Lesson Plan
Graph proportional relationships, with the unit rate as the slope, for two waves at constant speeds.
Question: Ask what students spot and what they are curious about. Read “At 80 km: how long is the gap?” aloud. Have each student guess and say why.
Question: Read “300 km away: how much warning?” aloud. Have partners explain their guesses to each other.
Big idea: Pause. Ask a student to say the idea in their own words.
Your turn: Have students try their own. Ask them to predict before they test.
How to run it
Whole classPut the lesson on the board. At each choice the class votes, then you select the winner.
SoloShare the link, QR code, or post to Google Classroom. Each student gets to take their own path.
