4.1+++Paying+in+Installments+10-11

May 29, 2011 A.N Block 7B

= __**Big Understanding- Many real world situations can be modeled and predicted using mathematics.**__ = __ Essential Question #4: How can I use math symbols to describe a pattern? __ Problem 4.2 Paying in Installments The Unlimited Store allows any customer who buys merchandise costing over $30 to pay on an installment plan. The customer pays 30$ down and then pays $15 a month until the item is paid for.

** Suppose you buy a $195 CD-ROM drive from the Unlimited Store or an installment plan. How many months wll it take you to pay for the drive? Describe how you found your answer. ** It will take 11 months to pay for the CD-ROM drive from the Unlimited Store. I found my answer by using the equation, y=15x+30. I found out that 195-30=165 so then, I divided 165 by 15 which gave me 11. And, 11 is the number of months it will take to pay for the CD-ROM drive in installments.

Problem 4.1 Follow-Up **1**. **Write down the sequence of steps you used the find the solution to problem 4.1. Try to use mathematical symbols and not jus** ** t words to describe your steps. ** This is the sequence of steps I used to find my answer- 195=15x+30 195- 30 =30- 30 +15x 165=15x 165/ 15 =15x/ 15 11=x **2**. **Make up a problem similar to problem 4.1, and solve it using your method from question 1.**

Suppose you buy a $850 Television from the Unlimited Store on an installment. How many months will it take you to pay for the Television. Explain how you solved the problem using the method from question 1.



This is the sequence of steps I used to find my answer 850=15x+550 850- 550 =550- 550 +15x 300=15x 300/ 15 =15x/ 15 20=x