### Home > CCA > Chapter 2 > Lesson 2.1.1 > Problem2-9

2-9.

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

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

1. 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.

$1\le y\le3$