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Find the equation of the line through the points (-1, -2, 1) and (1, 2, 5).

Answer»


ANSWER :The direction ratios of the TWO lines are 2-4, 3-7, 4-8 i.e., -2, -4, -4 and 1+1, 2+2, 5-1 i.e., 2, 4, 4 respectively.
Two lines are PARALLEL if their direction ratios are proportional
Since `(-2)/2-(-4)/4=(-4)/4`, the two linesa are parallel.


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