If the equations of a line AB are 
write the direction ratios of a line parallel to AB.
We have,
The equation of the line AB can be re-written as,
Thus, the direction ratios of the line parallel to AB are proportional to -1, -2, 4.
1
If the equations of a line AB are write the direction ratios of a line parallel to AB.
We have,
The equation of the line AB can be re-written as,
Thus, the direction ratios of the line parallel to AB are proportional to -1, -2, 4.