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INTRODUCTION
TO RELATIONS
Analytic Geometry​
3
Length of
Femur
(cm)
x
Height
(in.)
y
45.5 65.5
48.2 68.0
41.8 62.2
46.0 66.0
50.4 70.0
Ordered Pair
(45.6, 65.5)
(48.2, 68.0)
(46.0, 66.0)
(41.8, 62.2)
(50.4, 70.0)
Each data point from the table may be
represented as an ordered pair. In this
case, the first value represents the length of
the woman’s femur, and the second is the
woman’s height. The set of ordered pairs
{(45.5, 65.5), (48.2, 68.0), (41.8, 62.2),
(46.0., 66.0), (50.4, 70.0)} defines a relation
between femur length and height.
4
DEFINITION OF A RELATION IN X AND Y
5
Any set of ordered pairs (x, y) is called a
relation in x and y. Furthermore,
• The set of first components in ordered pairs
is called the domain of the relation.
• The set of second components in the
ordered pairs is called the range of the
relation.
Find the domain and range of the relation linking the length of a
woman’s femur to her height {(45.5, 65.5), (48.2, 68.0), (41.8, 62.2
(46.0., 66.0), (50.4, 70.0)}.
Solution:
Domain: {45.5, 48.2, 41.8, 46.0, 50.4} Set of first
coordinates
Range: {65.5, 68.0, 62.2, 66.0, 70.0} Set of second
coordinates
Example 1. Finding the domain and range of a
relation
6
Answer:
Domain{0, −8,
1
2
, −3}
Range {0, 4, 1}
Skill Practice
7
1.Find the domain and range of the
relation.
{ 0,0 , −8, 4 ,
1
2
, 1 , −3, 4 , (−8,0)}
Answer:
{(Bear, 22.5), (Cat,
11), (Deer, 12.5),
Dog, 11)
Domain
{𝐵𝑒𝑎𝑟, 𝐶𝑎𝑡, 𝐷𝑒𝑎𝑟, 𝐷𝑜𝑔}
Range {22.5, 11,
12.5}
Skill Practice
8
2. The table gives the longevity of four
types of animals. Write the ordered
pairs (x, y) indicated by this relation,
and state the domain and range.
Animal,
x
Longevity
(years)
y
Bear 22.5
Cat 11
Deer 12.5
Dog 11
A relation may consist of a finite number of ordered pairs or
an infinite number of ordered pairs. Furthermore, a relation
may be defined by several different methods: by a list of
ordered pairs, by a correspondence between the domain
and range, by a graph, or by an equation.
9
10
Skill Practice. Find the domain and range
1. 2.
3. 4.
THANK YOU

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Introduction-to-relations_2.pptx

  • 1.
  • 3. 3 Length of Femur (cm) x Height (in.) y 45.5 65.5 48.2 68.0 41.8 62.2 46.0 66.0 50.4 70.0 Ordered Pair (45.6, 65.5) (48.2, 68.0) (46.0, 66.0) (41.8, 62.2) (50.4, 70.0)
  • 4. Each data point from the table may be represented as an ordered pair. In this case, the first value represents the length of the woman’s femur, and the second is the woman’s height. The set of ordered pairs {(45.5, 65.5), (48.2, 68.0), (41.8, 62.2), (46.0., 66.0), (50.4, 70.0)} defines a relation between femur length and height. 4
  • 5. DEFINITION OF A RELATION IN X AND Y 5 Any set of ordered pairs (x, y) is called a relation in x and y. Furthermore, • The set of first components in ordered pairs is called the domain of the relation. • The set of second components in the ordered pairs is called the range of the relation.
  • 6. Find the domain and range of the relation linking the length of a woman’s femur to her height {(45.5, 65.5), (48.2, 68.0), (41.8, 62.2 (46.0., 66.0), (50.4, 70.0)}. Solution: Domain: {45.5, 48.2, 41.8, 46.0, 50.4} Set of first coordinates Range: {65.5, 68.0, 62.2, 66.0, 70.0} Set of second coordinates Example 1. Finding the domain and range of a relation 6
  • 7. Answer: Domain{0, −8, 1 2 , −3} Range {0, 4, 1} Skill Practice 7 1.Find the domain and range of the relation. { 0,0 , −8, 4 , 1 2 , 1 , −3, 4 , (−8,0)}
  • 8. Answer: {(Bear, 22.5), (Cat, 11), (Deer, 12.5), Dog, 11) Domain {𝐵𝑒𝑎𝑟, 𝐶𝑎𝑡, 𝐷𝑒𝑎𝑟, 𝐷𝑜𝑔} Range {22.5, 11, 12.5} Skill Practice 8 2. The table gives the longevity of four types of animals. Write the ordered pairs (x, y) indicated by this relation, and state the domain and range. Animal, x Longevity (years) y Bear 22.5 Cat 11 Deer 12.5 Dog 11
  • 9. A relation may consist of a finite number of ordered pairs or an infinite number of ordered pairs. Furthermore, a relation may be defined by several different methods: by a list of ordered pairs, by a correspondence between the domain and range, by a graph, or by an equation. 9
  • 10. 10
  • 11.
  • 12.
  • 13.
  • 14.
  • 15.
  • 16.
  • 17. Skill Practice. Find the domain and range 1. 2. 3. 4.