# Solve linear inequalities 2<8

 By definition, the slope or gradient of a line describes its steepness, incline, or grade.m = y2 - y1 x2 - x1
= tan(θ)

You watching: Solve linear inequalities 2<8  ## If the 2 Points are Known

 X1 Y1 X2 Y2

## If 1 Point và the Slope are Known

 X1 = Y1 = distance (d) = 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 m describes based on its sign and value:

A line is increasing, và goes upwards from left to right when m > 0A line is decreasing, and goes downwards from left khổng lồ right when m A line has a constant slope, and is horizontal when m = 0A vertical line has an undefined slope, since it would result in a fraction with 0 as the denominator. Refer lớn the equation provided below.

Slope is essentially the change in height over the change in horizontal distance, & is often referred khổng lồ 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.

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The slope is represented mathematically as:

 m = y2 - y1 x2 - x1

In the equation above, y2 - y1 = Δy, or vertical change, while x2 - x1 = Δx, or horizontal change, as shown in the graph provided. It can also be seen that ΔxΔy are line segments that size a right triangle with hypotenuse d, with d being the distance between the points (x1, y1)(x2, y2). Since Δx and Δy khung a right triangle, it is possible lớn calculate d using the Pythagorean theorem. Refer lớn the Triangle vietmac.com.vn for more detail on the Pythagorean theorem as well as how khổng lồ calculate the angle of incline θ provided in the vietmac.com.vn above sầu. Briefly:

d = √(x2 - x1)2 + (y2 - y1)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 & y values given by two points. Given two points, it is possible to lớn find θ using the following equation:

m = tan(θ)

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

 m = 8 - 4 6 - 3
=4
3

d = √(6 - 3)2 + (8 - 4)2 = 5

 4 3
= tan(θ)
 θ = tan-1( 4 3
) = 53.13°

While this is beyond the scope of this vietmac.com.vn, 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 sầu varies, và 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 sầu at that point.