Hello- how do I solve this problem? I'm very confused about how to approach it?

Problem 5 - The Demand curve of an item that is a perfect complement to all else. Suppose Joe considers gasoline a perfect complement to all other goods. For each $200 he spends on other items, Joe purchases 10 gallons of gas.]oe's monthly budget is $2,300, gasoline costs $3 per gallon. a) In a diagram measuring gallons of gasoline along the horizontal axis and money spent on other items along the vertical axis dranoe's budget line. b) How many gallons of gas does Joe buy each month? How much money does he spend on gas? Explain your reasoning. c) In your diagram, add an indifference curve and illustrate Joe's optimal choice (keep in mind that given Joe's tastes his indifference curves are L shaped). d) Last call PG the unit price of gasoline (in dollars per gallon) and qG the number of gallons of gas and nd the expression of Joe's monthly demand for gas ((13 :D(Pc,)). Explain your reasoning