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State whether each of the following equations are functions or not:

  1. $x+y = 4$
  2. $y=\frac{x}{4}$
  3. $y=2^x$
  4. $x^2 + y^2 = 4$
in Grade 12 Maths by Bronze Status (5.9k points)
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All of them are functions. For each possible value of x there is only one possible value for y. Even when x is negative or zero, y will always have an unique value.
by Wooden (1.7k points)

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