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AnaJulie12
@AnaJulie12
January 2020
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Pagou-se uma compra no valor de R$950,00 com notas de R$10,00 e R$50,00, num total de 47 notas. Quantas notas de cada espécie foram usadas no pagamento?
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TiagoEd
X + y = 47
10x + 50y = 950
x = 47-y
10(47-y) + 50y = 950
470-10y+50y = 950
-10y+50y = 950-470
40y = 480
y= 12
x + y = 47
x+12 = 47
x = 47-12
x = 35
Resposta: Foram usadas 12 notas de R$50,00, e 35 notas de R$10,00.
7 votes
Thanks 8
AnaJulie12
Obrigado ajudou muito☺
TiagoEd
Por nada! :)
luisferreiranet
35 notas de 10 reais e 12 notas de 50 reais
1 votes
Thanks 0
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Lista de comentários
10x + 50y = 950
x = 47-y
10(47-y) + 50y = 950
470-10y+50y = 950
-10y+50y = 950-470
40y = 480
y= 12
x + y = 47
x+12 = 47
x = 47-12
x = 35
Resposta: Foram usadas 12 notas de R$50,00, e 35 notas de R$10,00.