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How do you test to see if a graph is a function? - Answers

The test is: If you were to draw a vertical line through every point in the domain (every x-value that is allowed), would it intersect the graph in exactly one point? Rather than draw lines, you could just slide a ruler, keeping it parallel to the vertical (y) axis. If no intersection, then it is not a function because there is a point in the domain which has no image in the range. If more than one intersection, then it is not a function because there is a point in the domain that is mapped to more than one value in the range.



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How do you test to see if a graph is a function? - Answers

https://math.answers.com/math-and-arithmetic/How_do_you_test_to_see_if_a_graph_is_a_function

The test is: If you were to draw a vertical line through every point in the domain (every x-value that is allowed), would it intersect the graph in exactly one point? Rather than draw lines, you could just slide a ruler, keeping it parallel to the vertical (y) axis. If no intersection, then it is not a function because there is a point in the domain which has no image in the range. If more than one intersection, then it is not a function because there is a point in the domain that is mapped to more than one value in the range.



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https://math.answers.com/math-and-arithmetic/How_do_you_test_to_see_if_a_graph_is_a_function

How do you test to see if a graph is a function? - Answers

The test is: If you were to draw a vertical line through every point in the domain (every x-value that is allowed), would it intersect the graph in exactly one point? Rather than draw lines, you could just slide a ruler, keeping it parallel to the vertical (y) axis. If no intersection, then it is not a function because there is a point in the domain which has no image in the range. If more than one intersection, then it is not a function because there is a point in the domain that is mapped to more than one value in the range.

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      The test is: If you were to draw a vertical line through every point in the domain (every x-value that is allowed), would it intersect the graph in exactly one point? Rather than draw lines, you could just slide a ruler, keeping it parallel to the vertical (y) axis. If no intersection, then it is not a function because there is a point in the domain which has no image in the range. If more than one intersection, then it is not a function because there is a point in the domain that is mapped to more than one value in the range.

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