I. BASICS FUNCTIONS
AND GRAPHS
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What are VARIABLES?

 

Variables can be considered containers filed with numbers 
(as in the following picture).

 

Variable y  
consists of 
positive 
integers 
less or
equal to 6
.

 

 

Variable x  
consists of 
positive 
integers 
less or 
equal to 5.

 

 

Note: Variables frequently contain infinite sets of numbers, either countable or uncountable. Such variables would be difficult to represent as the above picture, so in our examples we will use just variables with finite sets of numbers.

 

 

 

 

 

 

 

 

 

 

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