This is true for many reson the answer is that it used to be called "module of slope" but now its just called slope.
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It is not documented why the letter m was chosen for slope. However, mathematician John Conway suggested that m could mean 'modulus of slope'.
If you mean: y = mx+b then the slope of the line is m and the y intercept is b
In slope intercept form, m IS the slope. y = mx + b slope is change in height divided by change in x direction.
If you mean: y = mx+b then 'm' is the slope and 'b' is the y intercept for a straight line equation
If you mean y = mx+b then the slope is m and the y intercept is b