What does the horizontal line test tell you?
If the inverse, f-1, is a function.
The horizontal line test is a mathematical tool used to determine if a function is one-to-one or not. It is used by drawing a horizontal line through the graph of the function.
If the line intersects the graph at only one point, then the function is one-to-one. This means that for every output value (y-value), there is only one unique input value (x-value). This ensures that the function has no repeated y-values or vertical asymptotes.
If the line intersects the graph at more than one point, then the function is not one-to-one. This means that there are two or more input values that produce the same output value, also known as horizontal asymptotes.
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