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Suppose that the relation [tex]\( S \)[/tex] is defined as follows:

[tex]\[ S = \{(2, a), (0, 2), (3, c), (3, b)\} \][/tex]

Give the domain and range of [tex]\( S \)[/tex]. Write your answers using set notation.

Sagot :

To find the domain and range of the relation [tex]\( S = \{ (2, a), (0, 2), (3, c), (3, b) \} \)[/tex], let's understand the definitions first:

1. Domain: The domain of a relation is the set of all first elements (or inputs) in the ordered pairs of the relation.
2. Range: The range of a relation is the set of all second elements (or outputs) in the ordered pairs of the relation.

Now, let's identify the domain and range from the given set [tex]\( S \)[/tex].

Step-by-Step Solution:

1. List the ordered pairs in the relation [tex]\( S \)[/tex]:
[tex]\[ S = \{ (2, a), (0, 2), (3, c), (3, b) \} \][/tex]

2. Identify the first elements (those will form the domain):
- The first element of the pair [tex]\( (2, a) \)[/tex] is [tex]\( 2 \)[/tex].
- The first element of the pair [tex]\( (0, 2) \)[/tex] is [tex]\( 0 \)[/tex].
- The first element of the pair [tex]\( (3, c) \)[/tex] is [tex]\( 3 \)[/tex].
- The first element of the pair [tex]\( (3, b) \)[/tex] is [tex]\( 3 \)[/tex].

3. Combine these first elements into a set (since sets do not include duplicates):
[tex]\[ \text{Domain} = \{ 0, 2, 3 \} \][/tex]

4. Identify the second elements (those will form the range):
- The second element of the pair [tex]\( (2, a) \)[/tex] is [tex]\( a \)[/tex].
- The second element of the pair [tex]\( (0, 2) \)[/tex] is [tex]\( 2 \)[/tex].
- The second element of the pair [tex]\( (3, c) \)[/tex] is [tex]\( c \)[/tex].
- The second element of the pair [tex]\( (3, b) \)[/tex] is [tex]\( b \)[/tex].

5. Combine these second elements into a set (again, no duplicates):
[tex]\[ \text{Range} = \{ a, 2, c, b \} \][/tex]

So, the domain and range of the relation [tex]\( S \)[/tex] are:

[tex]\[ \text{Domain} = \{ 0, 2, 3 \} \][/tex]
[tex]\[ \text{Range} = \{ a, 2, c, b \} \][/tex]