1. The problem statement, all variables and given/known data L1 passes through (1,-4,0) and (9,0,4) L2 passes through (2,-3,-1) and (4,-3,3) Do L1 and L2 intersect? If so, where? 2. Relevant equations Parametric equations(?) 3. The attempt at a solution A = (1,-4,0) B = (9,0,4) C = (2,-3,-1) D = (4,-3,3) AB = (-8,-4,-4) CD = (-2,0,-4) This question seems similar to a question asking for the intersection of a line between a line a, nd an x,y, or z plane, I would take the parametric equations of x y z. Solve for, the x y or z formula to find out what the parametric unknown must be to make the equation equal 0. Then sub in the parameter to the original x y z to find the coordinates. However, I've never done this kind of question, so I'm not totally sure wher to start. Can anyone give me a push in the right direction? Thanks!