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Domino Effect

How much is Domino’s really charging for pizza?

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Domino Effect

How much is Domino’s really charging for pizza?

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Domino Effect - Student Handout.pdf
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Domino Effect - Teacher Guide.pdf
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How much is Domino’s really charging for pizza? Domino’s Pizza offers a high-tech website for customizing and tracking your pizza. But it’s hard to know how much the pizza actually costs until right before you buy it.

In this lesson, students use slope, y-intercept, and linear equations to explore the costs of different-sized pizzas at Domino’s and debate whether the pizza chain should be more transparent in its pricing.

REAL WORLD TAKEAWAYS

  • Posted prices – or the fact that they’re hidden! – affect consumer behavior. Businesses choose when and how to share the price of items.

MATH OBJECTIVES

  • Given two points, calculate the rate of change between them
  • Write a linear equation from a rate of change and y-intercept
  • Graph a linear equation
Great anytime, including at the beginning of a unit before students have any formal introduction to the topic.
Grade 8
Writing Linear Equations
Grade 8
Writing Linear Equations
Content Standards 8.F.4 Construct 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. 8.F.5 Describe qualitatively the functional relationship between two quantities by analyzing a graph (e.g., where the function is increasing or decreasing, linear or nonlinear). Sketch a graph that exhibits the qualitative features of a function that has been described verbally.
Mathematical Practices MP.2 Reason abstractly and quantitatively. MP.1 Make sense of problems and persevere in solving them. MP.3 Construct viable arguments and critique the reasoning of others. MP.7 Look for and make use of structure.

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Great anytime, including at the beginning of a unit before students have any formal introduction to the topic.

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