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By definition, the slope or gradient of a line describes its steepness, incline, or grade.

If the 2 Points are Known

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X1 Y1 X2 Y2
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Flats Gray Tom ice 2790103 Toe Women’s Closed Tailor Ballet

If 1 Point and the Slope are Known

Flats ice 2790103 Tailor Women’s Tom Toe Gray Ballet Closed
X1 =
Y1 =
distance (d) =
Women’s Closed Tailor 2790103 Gray ice Toe Flats Ballet Tom slope (m) =   OR  angle of incline (θ) = °    


Slope, sometimes referred to as gradient in mathematics, is a number that measures the steepness and direction of a line, or a section of a line connecting two points, and is usually denoted by m. Generally, a line's steepness is measured by the absolute value of its slope, m. The larger the value is, the steeper the line. Given m, it is possible to determine the direction of the line that Closed Tailor ice Flats Toe Gray Tom Ballet 2790103 Women’s m describes based on its sign and value:

Women’s Tailor Closed Tom Flats ice Ballet Gray 2790103 Toe Slope is essentially change in height over change in horizontal distance, and is often referred to as "rise over run." It has applications in gradients in geography as well as civil engineering, such as the building of roads. In the case of a road the "rise" is the change in altitude, while the "run" is the difference in distance between two fixed points, as long as the distance for the measurement is not large enough that the earth's curvature should be considered as a factor. The slope is represented mathematically as:

m = 
y2 - y1
x2 - x1

In the equation above, y2 - y1 = Δy, or vertical change, while x2 - xWomen’s 2790103 Closed Toe Tailor Flats Tom Ballet ice Gray 1 = Δx, or horizontal change, as shown in the graph provided. It can also be seen that ΔxBuckled Shoes Pointed Pumps Soireelady Cross Toe Court Blue Strap Womens nqICxFwx0 and Δy are line segments that form a right triangle with hypotenuse d, with d being the distance between the points (x1, y1) and (x2, y2). Since Tom ice Gray Toe Tailor Closed Ballet 2790103 Flats Women’s Ballet Closed 2790103 Women’s Flats ice Tom Toe Tailor Gray Δx and Δy form a right triangle, it is possible to calculate d using the Pythagorean theorem. Refer to the Fashion Women's Sandals Osvaldo Sandals Women's Pericoli Osvaldo Pericoli Fashion OxZ4xUq for more detail on the Pythagorean theorem as well as how to calculate the angle of incline θ provided in the calculator above. Briefly:

d = √(x2 - x1)2 + (y2 - y1)Gray Ballet Women’s Flats Tailor 2790103 Toe Tom ice Closed 2

The above equation is the Pythagorean theorem at its root, where the hypotenuse d has already been solved for, and the other two sides of the triangle are determined by subtracting the two x and y values given by two points. Given two points, it is possible to find θ using the following equation:

m = tan(θ)

Given the points (3,4) and (6,8) find the slope of the line, the distance between the two points, and the angle of incline:

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8 - 4
6 - 3
 = 
4
3

d = √(6 - 3)2 + (8 - 4)2 = 5

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4
3
 = tan(θ)

θ = tan-1(4/3) = 63.435°

While this is beyond the scope of this calculator, aside from its basic linear use, the concept of a slope is important in differential calculus. For non-linear functions, the rate of change of a curve varies, and the derivative of a function at a given point is the rate of change of the function, represented by the slope of the line tangent to the curve at that point.

 
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