1. The problem statement, all variables and given/known data Is the line through (-2, 4, 0) and (1, 1, 1) perpendicular to the line through (2, 3, 4) and (3, -1, -8)? 2. Relevant equations R = R0 + tV (for each line) 3. The attempt at a solution If the lines are parallel, then the V for the two equations will be proportional to each other. How are the two V's related if they are perpendicular?