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LexyClaire
20.10.2019 •
Mathematics
Three pies and four quiches cost $36. two pies and five quiches cost $38. find the price of a pie and a quiche. show working out, .
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Ответ:
quiches = q = $6
3p + 4q = 36
2p + 5q = 38
2p = 38 - 5q
p = 19 - 2,5q
3×(19-2,5q) + 4q = 36
57 - 7,5q + 4q = 36
3,5q = 21
q = $6
Now, that we found out the price of one quiches, so place this value in formula:
2p + 5q = 38
2p + 5×6 = 38
2p + 30 = 38
2p = 8
p = $4
I hope that help you ^^
Ответ: