The two points are P(1, - 1, 7) and Q(7, 4, 1).
The two points form of vector equation : .
Substitute in the above equation.
The two points form of parametric equations :
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..![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=525d48db71c059275afb2b101a5eb060.png\")
in the above equation.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=ff26fedc50e8b1a023db853e31a8af85.png\")
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