Relations and Functions: Graphs Flashcards
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Questions and Answers

If K = {(x, y)|x - y = 5}, find the corresponding range of y for the domain {0, 2, 4}.

{-5, -3, -1} or {0, 2, 4}

If K = {(x, y) | x - y = 5}, is Set K a function?

True

Do the set of points in the figure represent a function?

False

Do the set of points in the figure represent a function? (1,2), (2,1), (3,0), (4,-1)

<p>True</p> Signup and view all the answers

For K = {(x, y) | x - y = 5}, what are the output pairs when the domain of x is 0, 2, 4?

<p>(0,-5), (2,-3), (4,-1)</p> Signup and view all the answers

Use the graph of the function to evaluate f(2).

<p>2</p> Signup and view all the answers

Study Notes

Relations and Functions

  • A relation K can be defined as K = {(x, y) | x - y = 5}.
  • For the domain {0, 2, 4}, the corresponding range of y can be found to be {-5, -3, -1}.

Function Criteria

  • Set K qualifies as a function as every x value maps to exactly one y value.
  • A set of points represents a function if each input (x) is paired with one and only one output (y).

Evaluating Functions

  • A graphical representation can help visually assess if a relation is a function.
  • Example: A vertical line test is often used; if any vertical line intersects the graph at more than one point, it is not a function.

Specific Examples

  • For the points (1,2), (2,1), (3,0), (4,-1), this set does represent a function since there are no repeating x-values.
  • If K is defined for the domain of x = 0, 2, and 4, the resulting ordered pairs are (0, -5), (2, -3), and (4, -1).

Function Evaluation

  • To evaluate a function at a specific point, such as f(2), the output is determined to be 2 based on the graph of the function.

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Description

This quiz provides flashcards focusing on relations and functions, specifically through graphs. It will test your understanding of function definitions, domains, and ranges through various questions and scenarios.

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