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Question 116

A water bill is 12eachmonthplus12 each month plus 3 for every cubic metre used. Which proportionality judgment is correct?

  1. It is directly proportional because the bill always increases.
  2. It is inversely proportional because greater use raises the bill.
  3. It is not directly proportional because zero use still costs $12.Bonne réponse
  4. It is directly proportional because each cubic metre adds $3.

Explication

The bill is 12evenwhennowaterisused,soitdoesnotpassthroughtheoriginandisnotdirectlyproportionaltousage.Thefixed12 even when no water is used, so it does not pass through the origin and is not directly proportional to usage. The fixed 3 variable rate may suggest proportion, but the unchanged monthly charge makes the bill-to-usage ratio vary.

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