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Vladimir79 [104]
3 years ago
12

Por una calculadora y un cuaderno habríamos pagado, hace tres días, 10,80 €. El precio de la calcula-dora ha aumentado un 8%, y

el cuaderno tiene una rebaja del 10%. Con estas variaciones, los dos artículos nos cuestan 11,34 €. ¿Cuánto costaba cada uno de los artículos hace tres días?
Mathematics
1 answer:
Inessa05 [86]3 years ago
4 0

Answer:

La calculadora y el cuaderno costaba 9 y 1,8 euros hace tres días.

Step-by-step explanation:

A partir del enunciado podemos construir el sistema de ecuaciones lineales:

Hace tres días:

x+y = 10.80 (1)

Actualmente:

1.08\cdot x + 0.9\cdot y = 11.34 (2)

Donde:

x - Precio de la calculadora.

y - Precio del cuaderno.

Por métodos algebraicos, tenemos que el sistema de ecuaciones tiene la siguiente solución:

x = 9, y = 1.8

La calculadora y el cuaderno costaba 9 y 1,8 euros hace tres días.

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3 years ago
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Explanation:
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All angles of any triangle must add up to 180 degrees.

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