gabbiej
03.10.2019 •
Mathematics
Mike bought 16 paperback books at the used book store for $10.95. some cost $0.60 and some cost $0.75. how many of each did he buy?
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Ответ:
y=number of books that cost 0.75
x+y=16
0.6x+0.75y=10.95
solve
multiply second equation by 10 for nicity
6x+7.5y=109.5
multiply first equesiotn by -6 and add to second
-6x-6y=-96
6x+7.5y=109.5 +
0x+1.5y=13.5
1.5y=13.5
divide both sides by 1.5
y=9
sub back
x+y=16
x+9=16
minus 6
x=7
seven 0.60 books and nine 0.75 books
Ответ:
Step by step:
Lemme get)