Just need help answering this

alger illipact on output. 3. Suppose the government decreasees expenditure. (a) Assuming the Fed wants to keep the interest rates constant, what must it do? Graphically show the impact of these policies in the IS-LM and AD-AS models. (b) Assuming the Fed wants to keep ouput /unemployment constant, what must it do? Graphically show the impact of these policies in the IS-LM and AD-AS models. (c) Assuming the Fed wants to keep prices /inflation constant, what must it do? Graphically show the impact of these policies in the IS-LM and AD-AS mod- els