Definition Of a Function              

                     Lesson 1

Problem:  Is the relation in chart below a function?

X	3	6	4	5	6	9
Y	3	4	5	6	7	8

Solution     A relation is simply a set of ordered pairs.

Step 1:

Solution     A function is a set of ordered pairs in which each x-element has  only

                                                            Step 2:         ONE y-element associated with it.                                                           

Solution     This relation is not a function. 

Step 3:  

                                                            Solution      Answer: NO

Step 4:

Complete

                                                            Try two practice problems:

A.

Evaluate:

If ƒ(x) = 11x + 13 find ƒ(2)

B.

Is the relation in chart below a function?

X	0	3	2	4	6	7
Y	0	3	2	4	6	7

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