The slope of any horizontal line is always zero. The word "slope" is defined as the incline or the steepness of a straight line. If a line is horizontal, there is no incline. More »

A horizontal line runs parallel to the horizon, at a 90 degree angle to a vertical line. A person lying down in a flat position would create a horizontal line; a standing person would create a vertical line. More »

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A horizontal line is a straight line that goes from left to right, which can be open or closed in form. On a coordinate plane, a horizontal line runs parallel to the x-axis. More »

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A tangent is a line that intersects a curve at only one point and does not pass through it, such that its slope is equal to the curve's slope at that point. To find a horizontal tangent, you must find a point at which th... More »

A horizontal line runs parallel to the horizon, at a 90 degree angle to a vertical line. A person lying down in a flat position would create a horizontal line; a standing person would create a vertical line. More »

www.reference.com Math Geometry

Calculating the slope of a line involves using a simple algebraic equation after identifying two points on the line. The equation is as follows: slope = (y1 - y2) / (x1 - x2). More »

To find the slope of a line in standard form, convert the line to slope intercept form. In slope intercept form, y = mx+b, m is the slope. More »

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