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In the fall of 2024, Citizen Math released updated versions of every lesson in our library, plus a few new ones! We know you may have already prepped an earlier version or planned a repeat of last year, so we're continuing to make these earlier versions available through Thursday December 5, 2024.

You can find the new lessons through the regular search, and we hope you love them as much as we do. You can read more about these updates in Our Community.

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.

- Posted prices can affect consumer behavior. Businesses choose when and how to share the price of items.
- Sometimes businesses don’t reveal the price of an item until the end of the ordering process.

- Given two points, calculate the rate of change (slope) and the y-intercept, and interpret them in a real-world context
- Write a linear equation from a rate of change and y-intercept
- Graph and interpret a linear function