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Margarita [4]
3 years ago
15

Aaliyah bought four composition notebooks and three packs of pencils from the school bookstore and paid $10.93.Laura bought seve

n composition notebooks and two packs of pencils and paid $13.31. If each pencil pack contains ten pencils,what is the unit price per pencil?
Mathematics
1 answer:
sveticcg [70]3 years ago
7 0
4c + 3p = 10.93....multiply by 7
7c + 2p = 13.31....multiply by -4
--------------------
28c + 21p = 76.51 (result of multiplying by 7)
-28c - 8p = - 53.24 (result of multiplying by -4)
------------------add
13p = 23.27
p = 23.27/13
p = 1.79 <== cost of 1 pencil pack

1.79/10 = 0.179 rounds to 0.18 <== unit price per pencil
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4 0
3 years ago
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