Example 3

Jonah wants to buy matching shirts for the freshman class officers. Each shirt costs $15, plus a standard shipping fee of $8 for any number of shirts ordered. Determine the slope of the line that passes through the points of the total cost of 1 shirt to 5 shirts. Explain what the slope means in the context of the problem. Finally, use the slope to determine how many shirts can be purchased for $115. Assume there is no sales tax.
  1. Create a table to show how the two quantities described vary.
  2. Graph the relationship.
  3. Determine the slope and what it means in the context of the problem.
  4. Use the slope to determine how many shirts can be purchased for $115.
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