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Gradient of Straight Line

Any line in the xy-plane can be expressed with equation in the form where and are the unknowns, are given real numbers such that .

 

 The form is equivalent with the following forms


  • , where , , and .
  • , where and , if  . 
  • , where , if .

 

The gradient of line   is if . Otherwise if , the gradient of this line is defined to be infinity ().

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Arg(x/y) = Arg(x) - Arg(y)

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