juliannabartra
06.06.2021 •
Mathematics
A library is having a book sale to raise money. Hardcover books cost $4 each and paperback books cost $2 each. Lauren spends $26 for 8 books.
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Ответ:
4×5
3×2
Step-by-step explanation:
a+b=8 or a=8-b
4a+2b=26
4(8-b)+2b=26
32-4b+2b=26
32-2b=26
32-26=2b
6=2b
b=3
a=8-3
a=5
Ответ: