How do you find the domain and range and determine whether the relation is a function given {(4,5), (6,5), (3,5)}?
1 Answer
May 30, 2017
See explanation.
Explanation:
If a relation is given as the set of points then:

the domain is the set of all first (
#x# ) coordinates of the points. Here we have:#D={3,4,6}# 
the range is the set of all second (
#y# ) coordinates. Here there is only one value of#y# , so rangeis a one element set:#R={2}# 
to find if a relation is a function you have to find out if all values in the domain occur only once (have only one value)
Here the condition is met, so it is a function.
If there was another value for any of already mentioned arguments (for example if a point