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Draw a graph of a given curve in the xoy plane. Now draw a vertical line so that it cuts the graph. If the vertical line cuts the graph in more than one ordinate then given graph is not a function. If it cuts the graph at a single ordinate such a graph is a function.(is called vertical line test)

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Q: How can you tell by looking at a graph its a function?
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How can you tell by looking at a graph if the represntation is a function?

if a certain abscissa corresponds to more than one ordinate, then it is not a function.


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How can you tell if a graph sHow is a function?

Test it by the vertical line test. That is, if a vertical line passes through the two points of the graph, this graph is not the graph of a function.


How do you determine if the graph of a function is concave down without looking at the graph?

If you can differentiate the function, then you can tell that the graph is concave down if the second derivative is negative over the range examined. As an example: for f(x) = -x2, f'(x) = -2x and f"(x) = -2 < 0, so the function will be everywhere concave down.


How can you tell if a graph is a continuous function or a discrete function?

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How can you tell if a function is a function?

The vertical line test can be used to determine if a graph is a function. If two points in a graph are connected with the help of a vertical line, it is not a function. If it cannot be connected, it is a function.


How do you tell if a graph is a function?

For a 2-dimensional graph if there is any value of x for which there are more than one values of the graph, then it is not a function. Equivalently, any vertical line can intersect the a function at most once.


Without using a graph how can you tell if an equation is a function or relation?

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How do you determine weather the graph represent a function?

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How can you tell if a graph show a FUNCTION?

By doing a vertical line test. If you can draw a vertical line and it only passes through the graph once, its a function. If it passes through twice, it is NOT a function.