Final answer:
Drew's error could be related to improperly setting up the inequalities or graphing the feasible region incorrectly. To determine the error, one must review the inequalities and graph to ensure they correctly reflect the budget constraint of $20 for at least 6 books, considering the prices of paperbacks and hardcovers.
Step-by-step explanation:
If Drew wants to buy at least 6 books with his $20, using the system of inequalities 2x + 5y ≤ 20 and x + y ≥ 6 to find the number of each type of book he should buy (where x is the number of paperbacks and y is the number of hardcovers), it's important to evaluate if Drew's process is correct. The first inequality, 2x + 5y ≤ 20, represents Drew's budget constraint, indicating that the cost of paperbacks and hardcovers he buys must not exceed $20. The second inequality, x + y ≥ 6, indicates that he wants to purchase at least 6 books in total.
However, Drew seems to have an error. To identify the mistake, let's investigate his inequalities and potential graphing errors. If Drew's inequality is set up and graphed correctly, the feasible region on the graph should represent all the combinations of paperbacks (x) and hardcovers (y) that satisfy both the budget limit and the minimum number of books he wants to purchase.
Looking at the example of budget constraints provided in the reference, where José's budget line illustrates the combinations of T-shirts and movies he can afford, we can draw parallels to Drew's situation. If Drew's graph does not accurately represent the region where both inequalities are satisfied, he has made an error related to option D: Drew's graph is not related to the problem.