Monday, September 15, 2014

Equations of straight lines

Two point form

y - y_1 = \frac{y_2 - y_1}{x_2 - x_1} (x - x_1),\,



One point and a gradient (Point slope form)

 y - y_1 = m( x - x_1 ),\,



 The distance between two points

 ,



 The midpoint of a line segment

 [(x_1 + x_2)/2 , (y_1 + y_2)/2],

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