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Home > AC > Chapter 11 > Lesson 11.2.1 > Problem 11-86


Which of the relations below are functions? Justify your answer.  

Do all of these graphs have one output value for every input value?

  1. This is a curve graph that looks like a wave oscillating between Y = 1 and Y = 3.

  1. This graph looks like a "W" with arrows on the ends pointing up and outward with turning points at (negative 1, comma 0), (1, comma 4), and (3, comma 0).

  1. This graph is a parabola or U shaped curve on its side with arrows at the end pointing right upward and right downward. The turning point of the U is at (negative 2, comma 1).