1. The problem statement, all variables and given/known data Explain why the line <x,y,z> = <3,1,4> + t<4,-5,2> is parallel to the plane with equation 2x + 2y +z = 7 2. Relevant equations The normal vector of <x,y,z> [4,-5,2] and the plane equation 2x + 2y + z = 7 3. The attempt at a solution Well, I'm trying to review for the final exam and I'm missing a crucial notes sheet. So, I attempted to do the dot product of the normal vector and the plane equation vector which is: 4*2 + -5*2 + 1*2 = 0 However, that didn't add up to 7 which would mean == lines. Though, I think by writing out the dot product I technically proved perpendicularity since plane equations are based off a vector and a point. Thus, making it perpendicular to that point. So if two bits are perpendicular to the same point then they are parallel to each other. Any help, would be much appreciated.