EXAMPLE 6 Solve a real-world problem SOLUTION STEP 1 Model each rental with an equation. Cost of one month’s rental online: y = 15 Cost of one month’s.

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EXAMPLE 6 Solve a real-world problem SOLUTION STEP 1 Model each rental with an equation. Cost of one month’s rental online: y = 15 Cost of one month’s rental locally: y = 4x, where x represents the number of DVDs rented DVD Rental You can rent DVDs at a local store for $4.00 each. An Internet company offers a flat fee of $15.00 per month for as many rentals as you want. How many DVDs do you need to rent to make the online rental a better buy?

EXAMPLE 6 Solve a real-world problem Graph each equation. STEP 2 The point of intersection is (3.75, 15). Using the graph, you can see that it is cheaper to rent locally if you rent 3 or fewer DVDs per month. If you rent 4 or more DVDs per month, it is cheaper to rent online.

GUIDED PRACTICE for Example 6 What If? In Example 6, suppose the online rental is $ per month and the local rental is $ 4 each. How many DVDs do you need to rent to make the online rental a better buy? 9. ANSWER 5 DVDs How would your answer to Exercise 9 change if you had a 2-for-1 coupon that you could use once at the local store? 10. ANSWEROnline rental would have to increase to 6 DVDs to be a better buy.