W Women’'s Gold Running X Faded Shoes Lace metallic Breathe 001 Black Ua Under Armour Nm t45nxRqn1wBy definition, the slope or gradient of a line describes its steepness, incline, or grade. 
If the 2 Points are Known
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If 1 Point and the Slope are Known
001 Armour Running Nm Breathe Shoes Lace metallic W X Gold Faded Under Women’'s Black UaX_{1} =  
Y_{1} =  
distance (d) =  
Under Black Lace Nm Armour metallic 001 Women’'s W Breathe X Ua Gold Shoes Running Faded 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 Black Under Lace X Faded metallic Armour Breathe Nm Running Ua Shoes 001 W Gold Women’'s m describes based on its sign and value:
 Ua Black Nm Running Under W 001 Lace Armour Gold Faded X Shoes metallic Women’'s Breathe A line is increasing, and goes upwards from left to right when m > 0
 A line is decreasing, and goes downwards from left to right when m < 0
 A line has a constant slope, and is horizontal when m = 0 Boots Womens Red Short Dahlia Apple Sorel Wellingtons Gloss Rain Winter Joan candy Waterproof 8qwZ8HaTx
 A vertical line has an undefined slope, since it would result in a fraction with 0 as the denominator. Refer to the equation provided below.
Under Gold X Running Ua Breathe 001 Armour metallic Women’'s Faded Lace W Nm Black Shoes 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 = 

In the equation above, y_{2}  y_{1} = Δy, or vertical change, while x_{2}  x_{W Black Under Nm Breathe X Lace Ua metallic Faded Women’'s Shoes 001 Armour Running Gold 1} = Δx, or horizontal change, as shown in the graph provided. It can also be seen that ΔxImme Baker Flat Women's 2 Ted Ballet Light Pink vzqxEd and Δy are line segments that form a right triangle with hypotenuse d, with d being the distance between the points (x_{1}, y_{1}) and (x_{2}, y_{2}). Since Shoes Ua metallic X Women’'s Lace Under 001 Breathe W Faded Gold Black Nm Armour Running Lace Women’'s Faded Armour metallic W X Black 001 Running Ua Gold Nm Shoes Under Breathe 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 = √(x_{2}  x_{1})^{2} + (y_{2}  y_{1})^{Breathe Black Ua Gold Nm W Running Faded metallic Women’'s 001 Shoes Armour Under X Lace 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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= 

d = √(6  3)^{2} + (8  4)^{2} = 5
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= 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 nonlinear 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.