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kylaprather06
28.07.2019 •
Mathematics
You have a total of 21 coins, all nickels and dimes. the total value is $1.70. write and solve a system of equations to find the number of dimes d and the number of nickels n that you have.
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Ответ:
1. You have a total of 21 coins, all nickels and dimes. Then:
x:nickels=5 cents
y: dimes=10 cents
x+y=21
2. You have that the total value is $1.70. Then:
5x+10y=170
3. The system of equation is:
x+y=21 (i)
5x+10y=170 (ii)
4. You have:
x+y=21
x=21-y
5(21-y)+10y=170
105-5y+10y=170
y=13 dimes
x+13=21
x=8 nickels
Ответ: