You look at the change in the vertical distance and divide that by the change in the horizontal distance. This is known as the rise over the run. So if the line goes 4 units and over 2 units, the slope or gradient is 4/2=2. Horizontal lines have slope 0 since the rise is 0
It is my2-y1/x2-x1 the points are (9,7) (6,5) x1 y1 x2 y2 m5-7/6-9 m= -3/-3 m-0 That is the gradient
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If you are finding out the gradient, then you are trying to find out the acceleration. The formula for this is acceleration = change in velocity/time.
a straight line
Drilling holes in a straight line
i believe you mean that the question is to do with the gradient of a line the gradient of a line is the change in height divided by the change in distance which is the same as slope divided by distortion if a man goes up a hill and his height cahnges by 1 metres vertically and he walks horizontally 10 metres then the slope is 1 metre and the distortion is 10 metres. Gradiend is 1 -10th or 10%.....
optical axis
something that shows the direction of a latitude line running straight to the equator