1 / 7

Solving Real-World Problem: Music Club

Calculate the number of songs downloaded based on the cost of joining and downloading songs in an internet music club.

colsen
Télécharger la présentation

Solving Real-World Problem: Music Club

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. EXAMPLE 1 Solving a Real-World Problem Music Club You pay $9.95 to join an Internet music club. You pay $.99 for each song that you download. Your cost for joining and downloading some songs is $17.87. How many songs did you download?

  2. The model below represents a way of finding how many songs you downloaded. You can use xto represent the number of songs. EXAMPLE 1 Solving a Real-World Problem

  3. 9.95 + 0.99x = 17.87 –9.95 –9.95 0.99x 7.92 = 7.92 0.99x 0.99 0.99 ANSWER You downloaded 8 songs. EXAMPLE 1 Solving a Real-World Problem SOLUTION Write an algebraic model. Subtract9.95from each side to undo addition. Simplify. Divide each side by 0.99 to undo multiplication. x = 8 Simplify. xis by itself.

  4. ? 9.95 8 = 17.87 + 0.99 ? 9.95 + 7.92 = 17.87 17.87 = 17.87 GUIDED PRACTICE for Example 1 1.Show how to check the solution in Example1.

  5. Cost to join + Cost per song Number of songs = Total cost 9.95 + 0.99x = 26.78 –9.95 –9.95 0.99x 16.83 = GUIDED PRACTICE for Example 1 2. What If? Suppose the cost to join and download some songs is $26.78. How does this change the equation in Example 1? Find the number of songs. SOLUTION Write an algebraic model. Subtract9.95from each side to undo addition. Simplify.

  6. 16.83 0.99x = 0.99 0.99 x =17 ANSWER You downloaded 17 songs. GUIDED PRACTICE for Example 1 Divide each side by 0.99 to undo multiplication.

  7. ANSWER You developed 19 rolls of films. GUIDED PRACTICE for Example 1 3. Film You pay $35 in dues to a photo club and $10 per roll you have developed. If you spend $225 during the year, how many rolls of film do you have developed? Use 10x+ 35 = 225 and solve for x.

More Related