In linear equations, the multiple of the x-term dictates the gradient of the graph when plotted. Thus y=3x has a gradient (or slope) of 3.
As it is the "multiple" of the x-term, "m" seems a sensible letter to use.
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Delta as a mathematical symbol usually means "change". It's usually used the same way in physics and chemistry, though it's sometimes used in chemical equations to represent heat.
Letters and symbols are used in equations to represent quantities, sometimes known or unknown. For example the symbol π (pi) represents the constant 3.14… and is unchanging. X or Y in an equation represent unknown terms that may vary depending on the equation, and other variables in the equation. There are numerous examples of both symbols and letters used in mathematical equations, but almost always they are either referring to a known constant term that is more simply expressed as a symbol, or an unknown or general term yet to be concretely determined.
A dependent system is defined as "a system of equations that has infinite solutions." It is an equation that is used in various mathematical situations.
the formula used to calculate a slope is: m=y2-y1/x2-x1
This is true for many reson the answer is that it used to be called "module of slope" but now its just called slope.