Which of the following is a demand function?

Which of the following is a demand function?

Q. Which of the following is a demand function?

  1. Q + 4P = 20
  2. Q = 35 + 3P
  3. Q โ€“ 2P โ€“ 15 = 0
  4. 5P โ€“ Q = 4

Answer: Q + 4P = 20

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