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# 2.1.1 functions and their graphs

## by Northside ISD on Aug 22, 2010

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## 2.1.1 functions and their graphsPresentation Transcript

• 2.1 Functions and Their Graphs
Formal Notation for Domain and Range
Relations vs. Functions (function notation)
More Domain Practice
• Domain – formal notation
The set of all possible values of the independent variable in a function.
read “x such that x belongs to …”
“x such that x is greater than …”
• … more possibilities for domain
x such that x is greater than or equal to …
x such that x is less than …
x such that x does not equal … (implies x can be all other real numbers)
• Range – formal notation
The set of all possible values of the dependent variable in a function.
read “y such that y belongs to …”
etc.
• Function -
A relation in which each value of x has a unique y value.
For example –
NOT a function
function
• Practice – Is it a function?
YES
NO
YES
YES
YES
NO
Corresponds to the point (0, -1)
Corresponds to the point (1, 2)