Answer:
X = the matrix; Y = the viral RNA
Step-by-step explanation:
X is the matrix of the HIV. It is composed of a protein and encloses a capsid which, in turn, encloses two copies of the viral RNA.
Y is the viral RNA itself.
The RNA is tightly associated with nucleocapsid proteins (which protect it from attack by nucleases) and to enzymes the virus needs to do its work.