EXAMPLE 5 Solve a multi-step problem Write an equation that represents the store’s monthly revenue. Solve the revenue equation for the variable representing.

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EXAMPLE 5 Solve a multi-step problem Write an equation that represents the store’s monthly revenue. Solve the revenue equation for the variable representing the number of new movies rented. Movie Rental A video store rents new movies for one price and older movies for a lower price, as shown at the right. The owner wants $12,000 in revenue per month. How many new movies must be rented if the number of older movies rented is 500? 1000?

EXAMPLE 5 Solve a multi-step problem SOLUTION Write a verbal model. Then write an equation. STEP 1 An equation is R = 5n 1 + 3n 2. Solve the equation for n 1. STEP 2

EXAMPLE 5 Solve a multi-step problem R = 5n 1 + 3n 2 R – 3n 2 = 5n 1 R – 3n 2 5 = n 1 Write equation. Subtract 3n 2 from each side. Divide each side by 5. Calculate n 1 for the given values of R and n 2. STEP 3 = If n 2 = 500, then n 1 12,000 – = If n 2 = 1000, then n 1 = ,000 – = If 500 older movies are rented, then 2100 new movies must be rented. If 1000 older movies are rented, then 1800 new movies must be rented. ANSWER

GUIDED PRACTICE for Example What If? In Example 5, how many new movies must be rented if the number of older movies rented is 1500 ? SOLUTION Write a verbal model. Then write an equation. STEP 1 An equation is R = 5n 1 + 3n 2.

GUIDED PRACTICE for Example 5 Solve the equation for n 1. STEP 2 R = 5n 1 + 3n 2 R – 3n 2 = 5n 1 R – 3n 2 5 = n 1 Write equation. Subtract 3n 2 from each side. Divide each side by 5. Calculate n 1 for the given values of R and n 2. STEP 3 = If n 2 = ,000 – = If 1500 older movies are rented, then 1500 new movies must be rented

GUIDED PRACTICE for Example What If? In Example 5, how many new movies must be rented if customers rent no older movies at all? SOLUTION Write a verbal model. Then write an equation. STEP 1 An equation is R = 5n 1 + 3n 2.

GUIDED PRACTICE for Example 5 Solve the equation for n 1. STEP 2 R = 5n 1 + 3n 2 R – 3n 2 = 5n 1 R – 3n 2 5 = n 1 Write equation. Subtract 3n 2 from each side. Divide each side by 5. Calculate n 1 for the given values of R and n 2. STEP 3 = If n 2 = 0, then n 1 12,000 – = If 0 older movies are rented, then 2400 new movie must be rented

GUIDED PRACTICE for Example Solve the equation in Step 1 of Example 5 for n 2. Solve the equation for n 1. R = 5n 1 + 3n 2 R – 5n 1 = 3n 2 R – 5n 1 3 = n 2 Write equation. Subtract 5n 1 from each side. Divide each side by 3. R – 5n 1 3 Equation for n 2 is