1. The problem statement, all variables and given/known data You have a vector, labelled A, with the coordinates (2,1,1). Subtract vector B, coordinates (3,-1,4) from vector A. 2. Relevant equations Take vector A, and flip vector B in the opposite direction. Line up vector B's tip to vector A's tail, and draw the new vector from tail to tip. What I am unsure about are those 3 coordinates. I have only learned in class to use two coordinates. What does the third one mean? 3. The attempt at a solution I'm guessing that one number is the x-component, and that one is the y-component. I have no idea what the third one would be, however. Also, I have no idea what order they are in!!