### Home > CCA > Chapter 2 > Lesson 2.1.1 > Problem 2-9

2-9.

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

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

For each graph above, state the domain and range.

The domain of a graph is its possible

*x*-values.All real numbers.

The range of a graph is its possible

*y*-values.1 ≤

*y*≤ 3