Parallel retreat of slope is a method of erosion by which the steep wash slope and free face of Pediments ( Gently inclined rocky floors close to mountains at their foot with or without a thin cover of debris ) retreat backwards.
So,through Parallel retreat of slopes, the pediments extend backwards at the expense of moutain front, and gradually ,the mountain gets reduced leaving only a remnant of the mountain (Inselberg).
This type of erosion reduce high relief in desert areas to low featureless plains.
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For two lines to be parallel they must have the same slope. A line parallel to a line with slope -2 would have a slope of -2.
Parallel lines have the same slope. So if you know the slope of a line in question, or you can calculate it, then you know the slope of any line parallel to that line.
if the slope of a line is 2/3, then the slope of a parallel line would be 2/3.
If two lines are parallel and one has a slope of 1.3, what is the slope of the other line?
The parallel line would also have a slope of zero (both are horizontal lines).