It stands for any process in which
- The size of some 'Bravo' depends on the size of some 'Alpha'.
- A change in the size of 'Alpha' produces a change in the size of 'Bravo' that's
(the size of the change in 'Alpha') times (always the same number) .
- 'Bravo' has some size when 'Alpha' is zero.
When the graph of the equation is drawn, it's a straight line, with [ slope = m ] and [ y-intercept = c ].
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The equation y = mx + b is the equation for a line in slope intercept form, with m being the slope, and b being the y-axis intercept.
graph
The x-intercept is equal to -b/m.
There is no difference; it is a matter of choice and convention as to what letter is used.
You draw a straight line through (0,b) which has a slope of m.