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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- anonymous

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.

- anonymous

d = 15.49 and o = 13.99 + 6?

- anonymous

what you need in those equations is a variable to represent the number of movies

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## More answers

- anonymous

m???

- anonymous

because if I buy 2 movies from the store it will be 2 * $15.49

- anonymous

so lets let x = the number of movies I want to buy and y is the amount of money it costs

- anonymous

if I buy from the store I multiply the number of movies I want to buy times the price of each movie right?

- anonymous

why not m and c?

- anonymous

that works too. m for movies and c for cash?

- anonymous

uhhuh ^^

- anonymous

so the way we can represent the price of movies at the local store is with
15.49m = c

- anonymous

that make sense?

- anonymous

*nods*

- anonymous

now we can make another equation that shows the price of buying movies online. Can you make that one?

- anonymous

i can one sec

- anonymous

13.99m + 6 = c

- anonymous

good

- anonymous

^^

- anonymous

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

- anonymous

hmm can we combine them?

- anonymous

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

- anonymous

its like saying 2+2 = 4 and 1 +3 =4 so we can say that 1 + 3 = 2 + 2

- anonymous

29.48m + 6 = c?

- anonymous

oh ota, so 15.49m = 13.99m + 6

- anonymous

yep

- anonymous

^^

- anonymous

can you solve from here?

- anonymous

i think so

- anonymous

let me know what you get

- anonymous

m = 4

- anonymous

yep

- anonymous

61.96 = c

- anonymous

the question didnt ask for that, but yeah good job!

- anonymous

it bothers me if i don't solve for all variables ... sorry

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