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ttrinityelyse17
12.10.2019 •
Mathematics
You have a total of 49 dimes and quarters. you have 7 more quarters than dimes. which system of equations can you use to find the number x of quarters and number y of dimes you have? use the system to determine how much money you have in quarters and dimes.
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Ответ:
49 = x + y
49 = y + y + 7
49 = 2y + 7
42 = 2y
y = 21
x = 21 + 7
You have 21 dimes and 28 quarters
Ответ:
21 dimes and 28 quarters
Step-by-step explanation:
To determine the number of quarters and dimes that you have, you can write the following equations:
x+y= 49 (1)
y= 7+x (2)
x= number of dimes
y= number of quarters
You have to replace 2 in 1:
x+(7+x)= 49
2x= 49-7
x= 42/2= 21
y= 7+21
y= 28
You have 21 dimes and 28 quarters.
Ответ:
10:19 15:27 20:36
Step-by-step explanation: