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Section 1 - Functions

This version was saved 16 years, 4 months ago View current version     Page history
Saved by PBworks
on December 19, 2007 at 4:07:21 pm
 

Meg Modzelewski

Kristin Huntington

 

 

Relation-a set of ordered pairs

                     {(1,5),(-2,3)}

Function-relation in Which every input (x) has only one output Cy)

              (does the x repeat Itself? If so, it's not a function)

vertical line test- If line crosses more than once, then It is not a function

 

Function Notation -f(x)

                             - reads as F of X

 

 

 

Ex. Which equation Represent y as a function of X?

      a.)   x2+ y= 1

                    y= -x2 +1

 

 

 

Yes it is a function because it passes the vertical line test.

 

       b.)  -x+Y2 =1

                  Y2  = x+1

                  Y2 =\sqrt{x+1}

                   y  = ±\sqrt{x+1}

 

 

 

 

Not a function because it does not pass the vertical line test.

      *if solve for y and get 2 equations, its not a function*

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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