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en.wikipedia.org/wiki/Horizontal_line_test

In mathematics, the horizontal line test is a test used to determine whether a function is injective ... (because they lie on the line y = c {\displaystyle y=c} y=c ) but different x values, which by definition means the function cannot be injective.

www.mathopenref.com/horizontal.html

In geometry, a horizontal line is one which runs from left to right across the page. It comes from the word 'horizon', in the sense that horizontal lines are parallel to ...

www.mathopenref.com/coordhorizontal.html

Definiton and equation for a horizontal line in coordinate geometry.

virtualnerd.com/algebra-1/linear-equation-analysis/intercept/horizontal-vertical-lines/horizontal-line-definition

It's a horizontal line! And just like the horizon, horizontal lines go straight left and right. ... definition; horizontal; graph; graphical; equation; horizontal; flat ...

study.com/academy/lesson/what-are-horizontal-lines-definition-equations-quiz.html

In this lesson, we will learn about horizontal lines. What properties are unique to horizontal lines? How do you recognize the graph or equation...

www.moomoomath.com/Horizontal-Vertical-Lines.html

What are the properties of a horizontal line, and a vertical line. Complete information about a horizontal line and a vertical line.

study.com/academy/lesson/horizontal-line-test-definition-lesson-quiz.html

The horizontal line test is a test used to determine if a function is a one-to-one function. This lesson will define how to perform the horizontal...

www.khanacademy.org/math/algebra/two-var-linear-equations/hor-and-ver-lines-alg1/v/examples-of-slopes-and-equations-of-horizontal-and-vertical-lines

The slope of a horizontal line = 0 because there is no change in Y, there is only a ..... What is the equation of the vertical line through negative five comma ...

www.mathsisfun.com/definitions/horizontal.html

Definition of. Horizontal. Horizontal. Going side-to-side, like the horizon. Parallel to the horizon. (Up-down is called vertical). See: Vertical ...