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I need help answering this question and knowing how to tell if a graph is a function or not?

I need help answering this question and knowing how to tell if a graph is a function-example-1
User Yuez
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In order to be a function, every value of x can have only one corresponding value of y.

If a value of x has two or more values of y, so the graph is not a function.

Looking at the graph, every value of x has only one corresponding value of y, therefore the graph is a function.

Another way of checking if the graph is a function is by imagining vertical lines along the graph. If a line intersects the graph more than one time, so the graph is not a function

If every vertical line intersects the graph only once, so the graph is a function.

Every red line intersects the graph only once (yellow dots), so the graph is a function.

An example where the graph is not a function is:

There are some red lines that have two or more intersects (in this case, two intersects), therefore the graph is not a function.

I need help answering this question and knowing how to tell if a graph is a function-example-1
I need help answering this question and knowing how to tell if a graph is a function-example-2
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