Two Types of Notation:
1. Set Builder Notation
{x | x > –2} is read “The set of all x such that x is greater than –2”
Interval Notation
(–2,) represents the set of all numbers greater than –2
Note that a left parenthesis “(“ indicates that –2 is not included. A parenthesis is always next to the infinity symbol . A relation is a set of ordered pairs.
If we denote the ordered pairs of a relation by (x,y),
the set of all x-values is called the domain, and
the set of all y-values is called the range.

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