Pre-Calculus

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Determine whether the equation represents y as a function of x.

|y| = 4 - x

If I plug in 5, then I get -1, but it also means 1. Does that mean y has 2 values which means that it is not a function?

  • Pre-Calculus -

    You are correct.

    There are two y's for each x. y is not a function of x.

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