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Unformatted text preview: et of ordered pairs.
A relation can be defined by:
• a set, { (−1,1) , (0,0) , (1,1) , (2,4) } • a table of values
x
y
−1
0
1
2 1
0
1
4 • an equation, y = x2
where x ∈ and −1 ≤ x ≤ 2 • a mapping diagram
x
y
−1
0
0
1
1
4
2 • a graph. y
4 1
−1 0 1 2 x The domain of a relation is the set of all the xcoordinates from the relation.
The range of a relation is the set of all the ycoordinates from the relation.
exercise: In the above example, domain =
exercise: In the above example, range = exercise: Write the domain and range of each relation graphed using set notation and as intervals.
a) b) c) (0,3)
(3,0) (0,−3) Unit 1 – Day 2: Functions Review and Quadratic Functions Page 2 of 4 A function is a special type of relation.
In a function, every xvalue from the domain is
paired with just one yvalue. A relation is not a function if there is an xvalue
that is paired with more than one yvalue. function
x →
y = x2
→ y not a function
x = 4 →
x = y2 y=2
y = −2 x = 2 → y = 4
x = −2 → y = 4 The Vertical Line Test for a Func...
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This document was uploaded on 02/16/2014 for the course MATH PreCalcul at Holy Cross Regional High School.
 Fall '11
 Aytona
 Calculus, PreCalculus, Polynomials

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