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Comparing Delivery Service Costs

Suppose you are a logistics coordinator comparing two delivery service providers for your company.

Provider A charges a flat rate of 120 dollars per month plus 5 dollars per delivery, represented by the cost equation y=5x+120y = 5x + 120 (where xx is the number of deliveries).

Provider B charges a flat rate of 150 dollars per month plus 5 dollars per delivery, represented by y=5x+150y = 5x + 150.

To find the number of deliveries where the monthly costs are equal, you set up the equation: 5x+120=5x+150{}5x + 120 = 5x + 150

After subtracting ${}5x$ from both sides, the variable is completely eliminated, resulting in the false numerical assertion: 120=150{}120 = 150

Perform the following recall-based tasks based on this mathematical outcome:

  1. State the specific mathematical classification term for this type of linear equation.
  2. State the size of its solution set (the number of solutions it has).
  3. Briefly explain the real-world business meaning of this mathematical result for your service comparison.

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Updated 2026-05-31

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