1. The problem statement, all variables and given/known data Identify the plane as parallel to the xy, xz and yz plane and sketch a graph 2. Relevant equations 3. The attempt at a solution I want to show you how I come up with these answers. Please click on the video (2 mins). It's a youtube link. After watching the video please tell me whether my method is valid. I will provide more example to verify: #1 y = -4 xz plane #2 z = -3 xy plane #3 x = 3 xz plane The followings are something I thought about... I don't know if the questions will support these extensions: <2,0,3> xz plane <0,2,3> yz plane <3,-2,1> xy plane Do you guys agree?