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afitzgerald
22.10.2020 •
Mathematics
Troy and Lisa were shopping for school supplies. Each purchased different quantities of the same notebook and thumb drive. Troy bought five notebooks and five thumb drives for $110. Lisa bought three notebooks and five thumb drives for $102. Find the cost of each notebook and each thumb drive.
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Ответ:
Notebooks cost $4
Thumb drives cost $18
Step-by-step explanation:
x=$ for notebooks
y=$ for thumb drives
5x + 5y = 110 > for Troy
3x + 5y = 102 > for Lisa
Use subtraction to find x.
(5x + 5y = 110)
-(3x + 5y = 102)
2x + 0y = 8
2x = 8
x=4
Sub 4 for x into 5x + 5y = 110
20 + 5y = 110
-20 -20
5y = 90
y=18
Notebooks cost $4
Thumb drives cost $18
Ответ: