M is simply just a random number picked by math maticians. Almost the whole alphabet stands for something.
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The slope is normally represented by m so it is 0.
slope can be represented by any variables, such that, the variable representing the slope is defined. by convention, mathematicians and mathematics books authors used and are using "m" as the variable for slope. (recommended to have further historical research on this matter)
y - 3x = 8 standard form is y = mx + b m = slope y = 3x + 8 in this form slope m is 3 The perpendicular line slope is the negative inverse of m -1/m = -1/3
If the slope of a line is m then the slope of an altitude to that line is -1/m.
The slope is -4