Concept explainers
To calculate:Which relation graphed below is a function?
Answer to Problem 18CR
The correct option is d .
Explanation of Solution
Given information:Four different graphs.
Formula used:Vertical line test. This test shows that if there is only one point in y corresponding to one value of x, then the graph is a function.
Calculation: Consider graph (a), draw a vertical line.
Clearly, there are more than one point corresponding to one value of x. Hence, this graph does not represent a function.
Consider graph (b), draw a vertical line.
Clearly, there are more than one point corresponding to one value of x. Hence, this graph does not represent a function.
Consider graph (c), draw a vertical line.
Clearly, there are more than one point corresponding to one value of x. Hence, this graph does not represent a function.
Consider graph (d), draw a vertical line.
Clearly, there is exactly one point corresponding to each unique value of x.
This graph represents a function.
Chapter 3 Solutions
Algebra and Trigonometry: Structure and Method, Book 2
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