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Ch. 2 - Functions and Graphs
Blitzer - College Algebra 8th Edition
Blitzer8th EditionCollege AlgebraISBN: 9780136970514Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testoBlitzer 8th EditionCh. 2 - Functions and GraphsProblema 59
Capitolo 3, Problema 59

Use the vertical line test to identify graphs in which y is a function of x.

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1
Recall that the vertical line test is used to determine if a graph represents a function. According to this test, if any vertical line intersects the graph at more than one point, then the graph does not represent y as a function of x.
Observe the given graph, which is an oval shape (an ellipse) centered roughly around (-5, 5) on the coordinate plane.
Imagine drawing vertical lines (lines parallel to the y-axis) at various x-values across the graph. Notice that for many x-values within the range of the oval, the vertical line will intersect the oval at two points: one on the upper half and one on the lower half of the oval.
Since there are vertical lines that intersect the graph at more than one point, this means that for some x-values, there are multiple corresponding y-values.
Therefore, based on the vertical line test, the graph does not represent y as a function of x.

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Vertical Line Test

The vertical line test is a method used to determine if a graph represents a function. If any vertical line drawn through the graph intersects it at more than one point, the graph does not represent a function because a single input (x-value) corresponds to multiple outputs (y-values).
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The Slope of a Line

Definition of a Function

A function is a relation where each input (x-value) has exactly one output (y-value). This means no x-value can be paired with more than one y-value. Understanding this definition is essential to applying the vertical line test correctly.
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Graphs of Common Functions

Graph Interpretation

Interpreting graphs involves understanding the relationship between x and y coordinates. In the given image, the oval shape crosses some vertical lines more than once, indicating multiple y-values for a single x-value, which helps conclude whether the graph is a function.
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Graphs and Coordinates - Example
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