Cartesian equations of a line AB are 
Write the direction ratios of a line parallel to AB
We have
Now, the equation of the line AB can be re-written as,
The direction ratios of the line parallel to AB proportional to → 1, -7, 2
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Cartesian equations of a line AB are Write the direction ratios of a line parallel to AB
We have
Now, the equation of the line AB can be re-written as,
The direction ratios of the line parallel to AB proportional to → 1, -7, 2