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Practice problem

What Are Variables? — Definition & Examples

By Victor Wang
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Knight Zero notices that whenever he starts with a number of horses, then buys a new horse, and then sells another horse, the number of horses stays the same. For example,

  • (0+1)−1=0(0+1)-1 = 0;
  • (1+1)−1=1(1+1)-1 = 1;
  • (2+1)−1=2(2+1)-1 = 2;
  • (3+1)−1=3(3+1)-1 = 3;
  • and so on.

He doesn't have room on his shield to carve this observation down, and paper is too expensive. What is a shorter but more abstract way to express Knight Zero's observation, if hh represents the number of horses he started with?

Choose one answer

Type a concept, like “slope” or “photosynthesis”.

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