Hey,

I do not understand whats happening here...

I have two planes in vector form, x1 = (3,2,-1)t and x2 = (1,0,1) + (1,1,1)s + (3,2,-1)t. I know they are parallel because the (3,2,-1)t part is the same. When trying to find the normal using cross product do i use the vectors (3,2,-1)t and (1,1,1)s ? Thanks.