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How do you determine a relation is function on a GRAPH?

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To Determine: How to determine a relation is function on a GRAPH

In other to achieve this, we will use the vertical test

If a vertical line is moved across the graph and, at any time, touches the graph at only one point, then the graph is a function. If the vertical line touches the graph at more than one point, then the graph is not a function

Check the image below for a better clarification

With the use of the vertical line test, the graph in OPTION C and OPTION D are functions and the graph in OPTION A and B are not functions

In summary, you determine a relation is a function on a graph by using a vertical line test

How do you determine a relation is function on a GRAPH?-example-1
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