If a friend offered to buy the car from you for $2,000 after 4 1/2 years owning it, would you sell?

Ask your teacher if he's okay because it can go both ways and this question is crazy. What if you bought a car for 1000 and you're like "hell yeh". But what if you bought a Lamborghini? You wouldn't sell it then. I'd probably just say no if you bought a brand new car. The reason why is because cars lose value over the years, depending on how much miles you put on the car, any accident, history of engine problems, etc. 

The right of a lender to refuse a loan if the borrower hasn't repaid previous loans on time

It's like discovering the answer to a puzzle. the purpose in solving an equation is to find the value or values of the variable that makes it a true statement. any value of the variable that makes the equation true is called a solution to the equation.