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Vladimir79 [104]

2 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?

1 answer:

Inessa05 [86]2 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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Step-by-step explanation:

Given

Geometry Progression

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