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# Functions

Algebra I: Danielle Flores
by

## Danielle Flores

on 17 September 2012

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#### Transcript of Functions

A set of ordered pairs is called a RELATION The x-values of a function are know as the DOMAIN. The y-values of a function are known as the RANGE How does this work? If y=x+7 , {x = -1, 0, 3}

How do we find the range? Substitute the x-values for x
and the answers are the range! You should put the numbers
in order from least to greatest! Did you write that down? The answer is: {6,7,10} Find the range for the other example. How do I find the domain of a relation? What is the domain?
{(0,-2) ,(0,0) (0, 10)} Domain is the x-values...so all you need to do is... Write the x-values! The answer is: {0} Find the domain for
the other example How do know if something is a function? The x-values cannot repeat Can the y-values repeat?

Yes!! Is this a function?
1. {(0,-2) ,(0,0) (0, 10)} No!

The x-values are all 0! Is this a function?

{(0,3) ,(-4,5)(5 ,9)} Yes!

None of the x's repeat! Sometimes we can find
the rule of a table through Guess & Check! Let's try it! I like using the calculator though!

And...sometimes you have to! What are the calculator steps? Here you go! 2. Type the x's in L1

3. Type the y's in L2 1. Go to STAT > Edit 4. Hit Stat > Calc > 4 5. Hit ENTER. 6. Put a next to the x