1.
Relations and
Functions
Kelley Wood
MEDT 7477
Dr. Cooper
Fall 2012
2.
What is a Relation?
A RELATION in math is what you would
think of when you here the word relationship
referring to people.
It’s a correspondence between two things.
4.
A relation is listed as a set of
ordered pairs. We’re familiar with
x- and y-values in an ordered
pair, but we learned some new
vocabulary words that refer to
these by different names.
5.
D.I.X.I
This is Dixi – She’s the X-value.
Her name is an acronym.
Domain
Input
X Value
Independent Variable
6.
R.O.Y. – D.
This is Roy D – He’s the yvalue.
His name is an acronym.
Range
Output
Y Value
Dependent Variable
8.
In order for a relation to be
a function, Dixi cannot
cheat on Roy-D.
9.
There are various ways to
represent relations. Listen
as Ms. Grajkowske explains
the different ways.
10.
Did you notice those
relations were not
functions? Well they
weren’t because -2 in the
domain was paired up with
2 and -2 in the range.
That’s CHEATING!!!!
11.
Remember in order for a
relation to be a function,
each element in the domain
can be paired with only one
element in the range.
12.
To Recap: Different Ways to Represent
Relations/Functions
Table
Mapping Diagram
Graph
Ordered Pair
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