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7477 digitalstory kew

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  • 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.
  • 3. In Math:
  • 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
  • 7. A Function is a Relation
  • 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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