The run (not runs - which means diarrhoea) is the horizontal change between two points.
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The constant rate of change between two points on a line is called slope.
The tangent line is the instantaneous rate of change at a point on a curve. The secant line crosses a curve twice at points A and B, representing the average rate of change between those two points.
A straight line is the shortest distance between two points, a line is the delineation of a connection between two or more points.
a line of best fit
Collinear.