How do you find the domain and range and is it a function given points #{(0,0), (2,2), (2,-2), (5,8), (5,-8)}#?

1 Answer
Daniel L.
Nov 12, 2016

See explanation.

Explanation:

If an assignment is given in the form of set of pairs, then to find if it is a function you have to check if there is only one value corresponding to each argument.

This is NOT a function because there are 2 arguments #2# and #5# each having two corresponding values.

Number #2# has #-2# and #2# assigned, number #5# has #8# and #-8#.

To find a domain of an assignment you write all values present in the first position in all pairs without repeating any values. So here we have:

#D={0,2,5}#

The range is set of all values in the second position without repeating any values. So here we have:

#R={-8,-2,0,2,8}#

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