Mortgage interest paid by a homeowner is deductible but consumer credit interest paid on a car loan

Question:

Mortgage interest paid by a homeowner is deductible but consumer credit interest paid on a car loan is not deductible under current income tax law in the United States. Draw a diagram like Figure 12.11 and explain why homeowners have an incentive to finance the purchase of a new car with a home equity loan rather than with a car loan.