The slope of a line = f'[x] = dy/dx = [ y₂ - y₁ / x₂ - x₁ ] = Tan θ
The positive slope depicts the fact that the two quantities represented on the two axes of the coordinate system do increase or decrease at the same time.
A line with positive slope = m > 0
The angle θ made by the line with the positive x-axis is an acute angle such that 0º < θ < 90º.
A positive slope equation looks like -
[image attached below]
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