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Write a system of equations to model each of the following situations. You don’t need to solve them!
A. One website charges $0.99 per song download, another website charges a one-time user fee of $12, but only charges $0.89 per song download.
B. Sean operates a lawn-cutting business. He charges $15 for a single lawn and $25 for a front and back lawn. Sean made $475 from 25 customers.
C. Brass is an alloy made by melting and mixing copper and zinc. A metallurgist has two brass alloys, one that is 65% copper and one that is 90% copper. He would like to combine a portion of each alloy to produce 500g of a new alloy that is 75% copper.
Sagot :
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