5. The domain of a relation is the set of all first coordinates of ordered pairs ( x values) .
The range of the relation is the set of all second coordinates of ordered pairs ( y values)
The four representations of a relation:
Mapping Diagram
1
2
3
4
5
2
4
6
8
10
6. Table of values
X Y
1 2
2 4
3 6
4 8
5 10
Graphing
Rule : y is twice the value of x or
y = 2x
7. Function is a special relation in which
every element in domain is
paired/mapped to exactly one element
in the range. Thus, a set of ordered
pairs is a function if no two distinct
ordered pairs have equal abscissas.
8. Types of Function
Injective or one to one function – each element of set A paired with exactly one element of set B.
Example
Justine
Kyle
Jaylou
Kian
Cristylin
Althea
Rozee
Karyl
9. Many to one function – maps to one or
more elements of Set A to same
element in Set B
Heizel
Nina
Althea
Krisha
Carla
With
honors
10. Given the ordered pairs:
( 0, 6), ( 1,5 ), ( 2, 4), (3, 3), ( 4, 2), ( 5, 1)
Determine the domain
Determine the range
Make a table of values
Draw a mapping diagram
Draw a graph
State the Rule
Assessment for Learning
