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www.reference.com/article/slope-line-perpendicular-x-axis-232a74b9013c84bc

A line that is perpendicular to the x-axis has an undefined slope. All of the points on such a line have the same x-coordinate. If the value of x never changes, then the formula for slope, (y2 - y1)/(x2 - x1), has a denominator of zero, which is mathematically undefined.

www.reference.com/article/calculate-grade-slope-746457890e300750

To calculate the grade of a slope, represented by the lowercase letter M, divide the rise, expressed as Y, by the run, expressed as X, then multiply by 100. The grade of a slope is most commonly expressed as a percentage.

www.reference.com/world-view/perpendicular-lines-e134ce18b32db971

Perpendicular lines are those that form a right angle at the point at which they intersect. Parallel lines, though in the same plane, never intersect.

www.reference.com/article/perpendicular-lines-3c3dd1850ef1c83a

Perpendicular lines are lines that intersect one another at a 90 degree angle. If two lines are perpendicular, then multiplying the slopes of the two lines together equals -1.

www.reference.com/article/use-calculate-roof-slope-1d700bb29317c82c

Taking measurements of the slope, or pitch, of a roof requires two ruled levels. The measurements take the form of a ratio that shows the height increase of the roof over a given distance.

www.reference.com/article/slope-calculated-using-rise-over-run-5ebc782216f0e323

Calculating slope using rise over run is determined by finding the change in the vertical and horizontal aspects of a line. The vertical axis of a line is considered the rise while the horizontal axis is referred to as the run. The difference in the vertical and horizontal values of the line equates

www.reference.com/article/formula-calculating-slope-line-3e822c737d5075fc

The formula for calculating the slope of a line when given two points, (x1, y1) and (x2, y2), is the difference in y coordinates divided by the difference in x coordinates. The slope, denoted as the letter m, equals (y2 - y1)/(x2 - x1).

www.reference.com/article/perpendicular-parking-353f000d193ddfa3

Perpendicular parking is done at a 90-degree angle to the curb. Perpendicular spaces make maneuvering the vehicle more difficult than angle parking, but the procedure requires fewer steps than parallel parking.

www.reference.com/article/slope-intercept-calculator-60046f72be4e3777

A slope intercept calculator is a tool used to determine the slope-intercept form of an equation for a line passing through two points on a Cartesian coordinates plane. Other uses include calculation of the slope itself as well as the y-intercept.

www.reference.com/article/slope-two-points-372b2e05bc19bde2

To find the slope of a line, you need the ratio of the change in y to the change in x. Even if there is no equation, you can still derive the slope by comparing two points on the line. After doing this, you can extrapolate the intercepts.