7. Using the IS-LM model, consider a situation where the government increases taxes and spending by the same amount. a. Describe the change in real and nominal income, using a diagram where appropriate. [2 points] b. Describe the change in the nominal and real interest rate, using the diagram in part (a) if relevant. [2 points] c. Prove how consumption changes (increase, no change, decrease) using a mathematical expression. [2 points] d. Describe how investment changes (increase, no change, decrease) in the resulting equilibrium, and provide intuition for your answer. [2 points]