What are the technical name for red blood cells white blood cells and platelets?

Aline is drawn through (–4, 3) and (4, 3). which describes whether or not the line represents a direct variation? the line represents a direct variation because   -4\3 =4\3the line represents a direct variation because it is horizontal. the line does not represent a direct variation because it does not go through the origin. the line does not represent a direct variation because –4(3) ≠  4(3).