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Lena [83]
3 years ago
10

A salesperson at a jewelry store earns 9% commission each week. Last week, Heidi sold $640 worth of jewelry. How much did she ma

ke in commission? How much did the jewelry store make from her sales?
Mathematics
1 answer:
KiRa [710]3 years ago
6 0

Answer:19.2

Step-by-step explanation:

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Cost of a pound of chocolate chips: $3.5

Cost of a pound of walnuts: $1.25

Step-by-step explanation:

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We create two equations based on the information we have:

3x+2y=13

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The whole point of these problems os to get rid of x or y. In this question, we can do this by multiplying both sides of the first equation by 2, and then subtracting it from the second equation:

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2x=7

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Then we change x for 3.5 in the first equation:

3×3.5+2y=13

10.5+2y=13

2y=2.5

y=1.25

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