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A vertical line can be used to test whether or not a graph is a function.

Q: What does a vertical line tell you?

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The "vertical line test" will tell you if it is a function or not. The graph is not a function if it is possible to draw a vertical line through two points.

You use the vertical line test. If you can draw a vertical line though the graph and it intersects it only once, it is a function. If the line crosses the graphs more than once it is not.

A vertical line!

A vertical line has an undefined slope. For the line to be parallel to a vertical line, the slopes would have to be the same. Therefore, the line parallel to a vertical line also has an undefined slope.

A horizontal line is a line perpendicular to the vertical.

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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.

The vertical line test! Imagine a vertical line going through all points of the graph. As long as the vertical line only touches the graphed line once, it's a function. If it touches more than once, it is not.

No, it does not. You can tell if something is a function or not by using the vertical line test. If there is more than one point at any vertical line, it is not a function.

The "vertical line test" will tell you if it is a function or not. The graph is not a function if it is possible to draw a vertical line through two points.

You use the vertical line test. If you can draw a vertical line though the graph and it intersects it only once, it is a function. If the line crosses the graphs more than once it is not.

A vertical line!

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.

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.

Vertical means up and down. A horizontal line goes from the left to the right (or from the right to the left) like this: ----------------------------- A horizontal line goes from a position that is low to a position that is high (or from a position that is high to a position that is low) like this: | | | | | | | | But the word "vertical" does not tell you which direction the line is drawn, just the it is a line.

A slope is 0 if it is a straight horizontal line. A slope is undefined if it is a straight vertical line.

WHY THE LINE X=4 IS A VERTICAL LINE.

A horizontal line is perpendicular to a vertical line.