Give two points A and B in 3d space with co-ordinates:
A(a,b,c) and B(a',b',c'), what is the equation of the line passing through both points?
Thanks for the help.
You can also write a line in three dimensions in "symmetric" form.
Solving each of those equations, for t,
I notice you asked for "the" equation of a line in three dimensions. Because a line is only one dimension, you need to "reduce" two dimensions and so need either two equations (3- 2= 1), as I give or introduce a new parameter, t, giving 4 variables with 3 equations: 4- 3= 1.