1. The problem statement, all variables and given/known data Determine if the vector x is unique. x = (-15, -3, 0) + x_3 (10, 0, 1) Note: The scalars should be vertically placed instead of horizontal. 3. The attempt at a solution Seeing that there is a free variable, I said that x is not unique, but my teacher marked it wrong. Why is it unique, and in what case would it not be unique?