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If an equation is a function, then:

  • The set of coordinates doesn't consists of the same first member. For instance, the set can't contain (1,2) and (1,1).
  • There exists only a function within the specific interval. For instance, f(x) = x within -1 ≤ x ≤ 1 and x + 2 within 1 < x ≤ 3. If f(x) = x and x + 2 within -1 ≤ x ≤ 1, then this doesn't make an equation the function.
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Q: How do you determine a equation that is function?
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