Relations and
Functions
Kelley Wood
MEDT 7477
Dr. Cooper
Fall 2012
What is a Relation?
A RELATION in math is what you would
think of when you here the word relationship
referring to people....
In Math:
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 som...
D.I.X.I
This is Dixi – She’s the X-value.
Her name is an acronym.
Domain
Input
X Value
Independent Variable
R.O.Y. – D.
This is Roy D – He’s the yvalue.
His name is an acronym.
Range
Output
Y Value
Dependent Variable
A Function is a Relation
In order for a relation to be
a function, Dixi cannot
cheat on Roy-D.
There are various ways to
represent relations. Listen
as Ms. Grajkowske explains
the different ways.
Did you notice those
relations were not
functions? Well they
weren’t because -2 in the
domain was paired up with
2 and -2 ...
Remember in order for a
relation to be a function,
each element in the domain
can be paired with only one
element in the r...
To Recap: Different Ways to Represent
Relations/Functions

Table

Mapping Diagram
Graph

Ordered Pair
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  1. 1. Relations and Functions Kelley Wood MEDT 7477 Dr. Cooper Fall 2012
  2. 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.
  3. 3. In Math:
  4. 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. 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. 6. R.O.Y. – D. This is Roy D – He’s the yvalue. His name is an acronym. Range Output Y Value Dependent Variable
  7. 7. A Function is a Relation
  8. 8. In order for a relation to be a function, Dixi cannot cheat on Roy-D.
  9. 9. There are various ways to represent relations. Listen as Ms. Grajkowske explains the different ways.
  10. 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. 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. 12. To Recap: Different Ways to Represent Relations/Functions Table Mapping Diagram Graph Ordered Pair

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