### Home > GB8I > Chapter 2 Unit 2 > Lesson INT1: 2.1.3 > Problem 2-34

2-34.

Which graphs below have a domain of all real numbers? Which have a range of all real numbers? Which are functions?

In which graph do all values of *x* have a corresponding *y*-value?

Refer to the Math Notes box in Lesson 1.2.5.

Graphs (a) and (b)

In which graphs do all values of *y* have a corresponding *x*-value?

Graphs (a) and (c)

A function can only have one -value for each

*-value.*