The horizontal line test is a simple, visual way to tell if your function has an inverse function. It’s useful because it tells us whether a function is one-to-one or not.

If the horizontal line intersects the graph of a function in all places at exactly one point, then the given function has an inverse that is also a function. We say this function passes the horizontal …

In mathematics, the horizontal line test is a test used to determine whether a function is injective (i.e., one-to-one). [1] A horizontal line is a straight, flat line that goes from left to right.

The horizontal line test tells you if a function is one-to-one. It’s also a way to tell you if a function has an inverse. Graph A on the left is one to one (injective), because it passes a horizontal line …

What Is the Horizontal Line Test? The horizontal line test checks if a function is one-to-one. A one-to-one function has only one x-value for each y-value. If a horizontal line passes through a …

Learn how to use the Horizontal Line Test to see if the inverse of a graph is a function in this free math video tutorial by Mario's Math Tutoring.

Once we have determined that a graph defines a function, an easy way to determine if it is a one-to-one function is to use the horizontal line test. A horizontal line includes all points with a …

Jul 3, 2025 · The Horizontal Line Test is a method used in mathematics to determine whether a function is one-to-one (injective). A function is considered one-to-one if it never assigns the …

What is the Horizontal Line Test? The Horizontal Line Test is a graphical method used to determine if a function is one-to-one or not. It is a simple test that involves drawing horizontal …

The Horizontal line test is a simple way to see if a function is one-to-one (that is, it has exactly y-value corresponding with every x-value, or dependent value for every independent value). If a …