Lesson 1 function as model

CHAPTER 1 FUNCTIONS
Lesson 1: Functions as models
@ReylkastroRey Lagrosa Castro @REYLKASTRO

LESSON 1: FUNCTIONS AS MODELS
The following table shows how relations and functions
are the same and how they are different.
A relation is a rule
that relates values
from a set of values
(called the domain)
to a second set of
values (called the
range)
A function is a
relation where
element in the
domain is related to
only one value in the
range by some rule.

A relation is a rule
that relates values
from a set of values
(called the domain)
to a second set of
values (called the
range)
A function is a
relation where
element in the
domain is related to
only one value in the
range by some rule.
Example:
f = {(1,3), (1,4), (2,5), (2,6), (3,7)}
h = {(1,3),(2,6),(3,9),...(n,3n),...}

Relation Function
The elements of the
domain can be
imagined as input to a
machine that applies a
rule to these inputs to
generate one or more
outputs.
The elements of the
domain can be
imagined as input to a
machine that applies a
rule so that each input
corresponds to only
one or outputs.

Relation Function
A relation is also a set
of ordered pairs (x,y).
A function is a set of
ordered pairs (x,y)
such that no two
ordered have the same
x-value but different y-
values.

Relation Function
A relation is also a set
of ordered pairs (x,y).
A function is a set of
ordered pairs (x,y)
such that no two
ordered have the same
x-value but different y-
values.
x2 + y2 = 1

FUNCTIONS AND RELATIONS AS A TABLE OF
VALUES
Example 1. Which of the following relations
are functions?
a. f = {(1,2),(2,2),(3,5),(4,5)}
b. g = {(1,3),(1,4),(2,5),(2,6),(3,7)}
c. h = {(1,3),(2,6),(3,9), ... (n,3n),...}

FUNCTIONS AND RELATIONS AS A TABLE OF
VALUES
Example 2. Which of the following mapping
diagrams represent functions?

FUNCTIONS AS A GRAPH IN THE CARTESIAN
PLANE
The Vertical Line Test
A graph represents a function if and only if each
vertical line intersects the graph at most once.

DOMAIN OF A RELATION

FUNCTIONS AS REPRESENTATIONS OF REAL-
LIFE SITUATIONS
Functions can often be used to model real life situations.

PIECEWISE FUNCTIONS

Lesson 1 function as model

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