<p>I don't know how approach this. Well I kinda do, but can someone give me a detailed explanation on how to do this? </p>

<p>The cost of a piece of a certain type of lumber is directly proportional to its length. A piece of lumber that is 8 feet long costs $6.00. What is the cost, in dollars, of a piece of this lumber that is y yards long? (1 yd = 3 ft)</p>