How do you find the domain and range of k(x)=9 k(x)=9?

1 Answer
Ryuu
Jun 12, 2017

Determine all possible values the function can have. In this case, it is "D": {x inRR} and "R": {y inRR | 9}.

Explanation:

This is a linear function; a straight line.

In addition, this is a horizontal straight line. I know this because the degree is 1, and there are no other variables.

Domain and range are sets of all possible values the function can have (may not be at the same time).

Because the function is a straight line at the (x,9), the domain is limitless unless context is given to restrict the function. The range however, is only at (x,9).

Therefore, the domain and range are:

"D": {x inRR}
"R": {y inRR | 9}

Unfortunately, Socratic cannot graph functions of horizontal/vertical straight lines... but just imagine a horizontal straight line at the (x, 9).

Hope this helps :)

Related questions
See all questions in Domain and Range of a Function
Impact of this question
1474 views around the world
You can reuse this answer
Creative Commons License