Question

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

Answer 1

Domain = `RR`
Range = `{7}=[7,7]`

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]}