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Glacis - a slope, especially one that is not very long or steep
Presumably the questions refer to contour lines. If that is the case, the answer is as follows: Contour lines are lines drawn at selected heights on a map. They are lines that join points at the same height above the meas sea level. A gentle slope is one that does not rise (or fall) as rapidly as a steep slope. That is to say, you have to travel a greater horizontal distance to gain (lose) the same amount of vertical distance or height. So, with a gentle slope, you have to travel a greater distance to get from one contour to the next and so the lines are less close together.
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Well, in the formula mx+b, m is the slope. So in y=2x-3, the slope is 2, otherwise meaning that every time x changes by one y changes by 2. Hope this helps! :)
1. You can tell the difference because the proportional one has the same slope while the inversely one has opposite reciprocal slope.