TLDR;
This video explains how to calculate the gradient (or slope) of a line using the formula A/B, where A represents the vertical change and B represents the horizontal change. It demonstrates the process by selecting two points on a line, creating horizontal and vertical dashed lines from those points to find their intersection, and then calculating the vertical and horizontal changes between the points to determine the gradient.
- Gradient is calculated as vertical change divided by horizontal change (A/B).
- Select two points on the line and find the vertical and horizontal changes between them.
- Substitute the values of A and B into the formula to find the gradient.
Introduction to Gradient Calculation [0:01]
The video introduces the concept of calculating the gradient, also known as the slope, of a line. The fundamental formula used for this calculation is A/B, where 'A' represents the vertical change and 'B' represents the horizontal change between two points on the line. This formula is key to understanding the steepness and direction of the line.
Determining Points and Drawing Lines [0:19]
To apply the A/B formula, the video explains the process of selecting two distinct points, labeled A and B, on the line in question. After identifying these points, the next step involves creating dashed lines extending horizontally and vertically from each point. These dashed lines help to visualize and measure the vertical and horizontal distances between the two points.
Calculating Horizontal Change (B) [1:07]
The video details how to calculate the horizontal change, denoted as 'B,' by measuring the distance from point A to the intersection point of the dashed lines. In the example, point A has an x-coordinate of -4, and the intersection point has an x-coordinate of 2. The horizontal change is calculated as the distance between these two points, which is six units to the right.
Calculating Vertical Change (A) [1:31]
The video explains the process of calculating the vertical change, denoted as 'A,' by measuring the distance from the intersection point to point B. In the example, the intersection point has a y-coordinate of -1, and point B has a y-coordinate of 2. The vertical change is calculated as the distance between these two points, which is three units upwards.
Final Calculation and Result [2:01]
After determining the values of A and B, which are 3 and 6 respectively, the video demonstrates how to substitute these values into the formula A/B. This results in the fraction 3/6, which simplifies to 1/2. Therefore, the gradient or slope of line F is 1/2, indicating a positive and relatively gentle slope.
