1.2.7 Lesson Summary

In this lesson, you learned how to:

• Tell which quantities in a situation can vary and which ones cannot.
• Use letters and numbers to write equations representing the relationships in a situation.

Here are the activities that helped you reach those goals:

• 1.2.1: Finding the Percent of 200 
  • In this activity, you found different percentages of 200 by changing the percent to a decimal and writing an expression.
• 1.2.2: Modeling with Equations to Find Edges in Platonic Solids
  • In this activity, you modeled the relationship between the edges, vertices, and faces of Platonic solids with an equation.
  • 1.2.2: Self Check
  • 1.2.2: Additional Resources
• 1.2.3: Writing Equations to Represent Relationships
  • In this activity, you worked to write more equations that modeled different situations.
  • 1.2.3: Self Check
  • 1.2.3: Additional Resources
• 1.2.4: Writing Equations to Represent Relationships with Percentages
  • In this activity, you continued to write equations to model given situations but incorporated percentages.
  • 1.2.4: Self Check
  • 1.2.4: Additional Resources
• 1.2.5: Writing Equations to Represent T-Shirts
  • In this activity, you wrote an equation about the cost of T-shirts for a choir group. You also identified which quantities were fixed in the situation and which quantities could change.

After these activities, you completed the following practice:

• 1.2.6: Practice