Answers:
Domain = {12, 10, 8, 6}
Range = {1, 3, 5, 7}
============================================
Step-by-step explanation:
The domain is the set of allowed x inputs. Simply list the x coordinates of each point.
The range will have us list the y coordinates of each point. This shows the list of possible outputs.
Use curly braces for the domain and range because each is a set of values.
Optionally you can sort the values. I decided not to sort them to keep the same order of coordinates mentioned from left to right.
{12,10,8,6} sorts to {6,8,10,12}
If there were any duplicate items, in either domain or range, then you would erase them. Simply list each unique item once.
-------------------
Extra info:
- This relation is a function because none of the domain values repeat themselves. Each x input leads to exactly one y output.
- Furthermore, the function is one-to-one (aka injective) because none of the y coordinates repeat themselves. Each x input leads to a unique or different y output.
- A one-to-one function is very useful when it comes to function inverses.