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Alexander went into a movie theater and bought 3 candies and 2 pretzels, costing a total of $17.50. Andres went into the same movie theater and bought 9 candies and 4 pretzels, costing a total of $44. Determine the price of each candy and the price of each pretzel.

Question

Alexander went into a movie theater and bought 3 candies and 2 pretzels, costing a total of 17.50.Andreswentintothesamemovietheaterandbought9candiesand4pretzels,costingatotalof17.50. Andres went into the same movie theater and bought 9 candies and 4 pretzels, costing a total of 44. Determine the price of each candy and the price of each pretzel.

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Solution

Vamos a resolver el problema paso a paso utilizando un sistema de ecuaciones lineales.

Primero, definimos las variables:

  • C C será el precio de cada caramelo.
  • P P será el precio de cada pretzel.

A partir de la información dada, podemos establecer las siguientes ecuaciones:

  1. Alexander compró 3 caramelos y 2 pretzels por un total de $17.50: 3C+2P=17.50 3C + 2P = 17.50

  2. Andres compró 9 caramelos y 4 pretzels por un total de $44: 9C+4P=44 9C + 4P = 44

Ahora, resolveremos este sistema de ecuaciones.

Primero, multiplicamos la primera ecuación por 2 para que los coeficientes de P P sean iguales en ambas ecuaciones: 2(3C+2P)=2(17.50) 2(3C + 2P) = 2(17.50) 6C+4P=35 6C + 4P = 35

Ahora tenemos el sistema de ecuaciones: 6C+4P=35 6C + 4P = 35 9C+4P=44 9C + 4P = 44

Restamos la primera ecuación de la segunda para eliminar P P : (9C+4P)(6C+4P)=4435 (9C + 4P) - (6C + 4P) = 44 - 35 3C=9 3C = 9 C=3 C = 3

Ahora que tenemos el valor de C C , lo sustituimos en una de las ecuaciones originales para encontrar P P . Usamos la primera ecuación: 3(3)+2P=17.50 3(3) + 2P = 17.50 9+2P=17.50 9 + 2P = 17.50 2P=17.509 2P = 17.50 - 9 2P=8.50 2P = 8.50 P=4.25 P = 4.25

Por lo tanto, el precio de cada caramelo es 3yelpreciodecadapretzeles3 y el precio de cada pretzel es 4.25.

This problem has been solved

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