When graphing a linear inequality, when can you not use (0,0) as a test point to determine witch side of the boundary line to shade? When the point (0,0)is below the boundry line. / when the point (0,0) is on the boundry line./ when the point (0,0) is part of the soulution./ when the point (0,0) is part of the solution. When the point (0,0) is above the boundry line.