# What is the domain and range of  y=7?

Jan 10, 2016

Domain = $\mathbb{R}$
Range = $\left\{7\right\} = \left[7 , 7\right]$

#### Explanation:

$y = 7$ is a straight line with zero slope and y-intercept 7 as shown below.

Hence its domain (all allowed x-values) is all real numbers, and its range (all allowed y-values) is only 7.

graph{0x+7 [-11.92, 20.11, -3.69, 12.33]}