there is a line through A : (1;-2; 1) and B : (0; 2; 3)
and the line through C : (4; 1;-2) and D : (2; 2; 2)
are they parallel?
The Attempt at a Solution
i said no they weren't.
i had the lines as being:
and then i took the cross product assuming constants don't count.
and got a determinant-y thing of 21 which is not 0 - why i said it wasn't parallel.
is my working correct?