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A relationship between inputs and outputs is a function if there is one and only one output for each input. Using this definition, decide if the relationships below are functions or not.

Are there any -values on these graphs or in the table that have multiple -values?

  1. Opening upward parabola, vertex on the origin.

  1. Sideways, V, opening to the right, vertex at the point (negative 2, comma 1).

  1. Increasing line, passing through the points (negative 5, comma negative 6), & (4, comma 0).