Podcast
Questions and Answers
What defines the domain of a relation?
What defines the domain of a relation?
Which of the following represents a function?
Which of the following represents a function?
What is the range of the relation {(1,3), (2,4), (5,6), (7,8)}?
What is the range of the relation {(1,3), (2,4), (5,6), (7,8)}?
What is the purpose of the vertical line test?
What is the purpose of the vertical line test?
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Which of the following scenarios does NOT represent a one-to-one function?
Which of the following scenarios does NOT represent a one-to-one function?
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Given the relation {(1,0), (0,1), (-1,0), (0,-1)}, is it a function?
Given the relation {(1,0), (0,1), (-1,0), (0,-1)}, is it a function?
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Which of the following is NOT a representation of functions?
Which of the following is NOT a representation of functions?
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Identify the domain of the relation {(-2,1), (0,-1), (5,3), (0,7)}.
Identify the domain of the relation {(-2,1), (0,-1), (5,3), (0,7)}.
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Study Notes
Functions and Relations
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Definitions
- A relation is a set of ordered pairs (x, y).
- The domain consists of all x-components (independent variable).
- The range consists of all y-components (dependent variable).
Ordered Pairs Example
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Given ordered pairs: {(1, 3), (2, 4), (5, 6), (7, 8)}
- Domain: {1, 2, 5, 7}
- Range: {3, 4, 6, 8}
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Another set of ordered pairs: {(-2, 1), (0, -1), (5, 3), (0, 7)}
- Domain: {-2, 0, 5}
- Range: {1, -1, 3, 7}
Function Characteristics
- A function maps each element of set x to exactly one element in set y.
Function Representations
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Mapping (One-to-One)
- Each domain value corresponds to one unique range value.
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Mapping (One-to-Many)
- A single domain value corresponds to multiple range values.
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Mapping (Many-to-One)
- Multiple domain values correspond to a single range value.
Function Validation
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Function Test: Ordered pairs
- {(1, 1), (2, 2), (3, 3), (4, 4)} is a function.
- {(1, 0), (0, 1), (-1, 0), (0, -1)} is not a function (0 cannot map to both 1 and -1).
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Table of values validation
- For table with x: -1, 0, 1, 2 and y: 2, -2, 3, 3 - not a function due to the value 3 being repeated for different x-values.
Graphical Representation
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Vertical Line Test:
- A relation is a function if a vertical line intersects the graph at only one point.
- If a vertical line intersects at more than one point, it is not a function.
Important Relationships
- All functions are relations, but not all relations are functions.
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Description
This quiz explores the fundamentals of functions and relations in mathematics. It covers definitions, different representations of functions, and the determination of domain and range. Test your understanding of ordered pairs and their significance in identifying domains and ranges.