1. ## Challenging Economics Question

Hi guys,
Once again im stuck with answering this question. Any kind of help would be much appreciated

Question:
David is confused. He has a limited income that he must allocate between his two favourite goods, A and B. David’s utility function for these goods is given by:
U(A,B)=4A+4B.
The price of good A is currently $6 and the price of B is currently$4.

a) David’s income is equal to $36. How much of A and B will he consume? Explain and carefully demonstrate David’s optimal choice on a graph. b) Suppose that price of good B increases from$4 to \$5. What is the total effect of this price change on Davis’s demand for goods A and B? What are the corresponding income and substitution effects? Explain and demonstrate your answer on a graph

Thanks heaps guys!

2. these are both standard questions and the relevent methods should be in any undergraduate microeconomics textbook. How far can you get?