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WhiteRabbit

  • 3 years ago

You can buy DVDs at a local store fro $15.49 each. You can buy them at an online sore for $13.99 each plus $6 for shipping. How many DVDs can you buy for the same amount at the two stores?

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  1. tjones89
    • 3 years ago
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    for this problem you need to create two equations; one that represents the amount of money it would cost to buy a certain amount of movies from the store, and another that shows the money it costs to buy a certain amount of movies online.

  2. WhiteRabbit
    • 3 years ago
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    d = 15.49 and o = 13.99 + 6?

  3. tjones89
    • 3 years ago
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    what you need in those equations is a variable to represent the number of movies

  4. WhiteRabbit
    • 3 years ago
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    m???

  5. tjones89
    • 3 years ago
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    because if I buy 2 movies from the store it will be 2 * $15.49

  6. tjones89
    • 3 years ago
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    so lets let x = the number of movies I want to buy and y is the amount of money it costs

  7. tjones89
    • 3 years ago
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    if I buy from the store I multiply the number of movies I want to buy times the price of each movie right?

  8. WhiteRabbit
    • 3 years ago
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    why not m and c?

  9. tjones89
    • 3 years ago
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    that works too. m for movies and c for cash?

  10. WhiteRabbit
    • 3 years ago
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    uhhuh ^^

  11. tjones89
    • 3 years ago
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    so the way we can represent the price of movies at the local store is with 15.49m = c

  12. tjones89
    • 3 years ago
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    that make sense?

  13. WhiteRabbit
    • 3 years ago
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    *nods*

  14. tjones89
    • 3 years ago
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    now we can make another equation that shows the price of buying movies online. Can you make that one?

  15. WhiteRabbit
    • 3 years ago
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    i can one sec

  16. WhiteRabbit
    • 3 years ago
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    13.99m + 6 = c

  17. tjones89
    • 3 years ago
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    good

  18. WhiteRabbit
    • 3 years ago
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    ^^

  19. tjones89
    • 3 years ago
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    so now the problem asks us how many movies we can buy with the same amount of money at the two stores or for what value of m will both of our equations result in the same number c

  20. WhiteRabbit
    • 3 years ago
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    hmm can we combine them?

  21. tjones89
    • 3 years ago
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    and since 13.99m + 6 = c and 15.49m = c we can set these equations equal to each other because we're assuming c is the same number in both

  22. tjones89
    • 3 years ago
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    its like saying 2+2 = 4 and 1 +3 =4 so we can say that 1 + 3 = 2 + 2

  23. WhiteRabbit
    • 3 years ago
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    29.48m + 6 = c?

  24. WhiteRabbit
    • 3 years ago
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    oh ota, so 15.49m = 13.99m + 6

  25. tjones89
    • 3 years ago
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    yep

  26. WhiteRabbit
    • 3 years ago
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    ^^

  27. tjones89
    • 3 years ago
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    can you solve from here?

  28. WhiteRabbit
    • 3 years ago
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    i think so

  29. tjones89
    • 3 years ago
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    let me know what you get

  30. WhiteRabbit
    • 3 years ago
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    m = 4

  31. tjones89
    • 3 years ago
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    yep

  32. WhiteRabbit
    • 3 years ago
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    61.96 = c

  33. tjones89
    • 3 years ago
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    the question didnt ask for that, but yeah good job!

  34. WhiteRabbit
    • 3 years ago
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    it bothers me if i don't solve for all variables ... sorry

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