Question
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Resolver sistemas de ecuaciones \( \begin{array}{c}x+2 y=5 \\ 3 x-4 y=2\end{array} \) ¿Cuál es el valor de y?

Ask by Klein Maxwell. in Mexico
Mar 10,2025

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Tutor-Verified Answer

Answer

El valor de \( y \) es \(\frac{13}{10}\).

Solution

**Paso 1.** Escribimos el sistema: \[ \begin{cases} x + 2y = 5 \\ 3x - 4y = 2 \end{cases} \] **Paso 2.** Despejamos \( x \) de la primera ecuación: \[ x = 5 - 2y \] **Paso 3.** Sustituimos \( x \) en la segunda ecuación: \[ 3(5 - 2y) - 4y = 2 \] **Paso 4.** Simplificamos la ecuación: \[ 15 - 6y - 4y = 2 \] \[ 15 - 10y = 2 \] **Paso 5.** Despejamos \( y \): \[ -10y = 2 - 15 \] \[ -10y = -13 \] \[ y = \frac{-13}{-10} = \frac{13}{10} \] El valor de \( y \) es \(\frac{13}{10}\).

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Bonus Knowledge

Para resolver el sistema de ecuaciones, puedes utilizar el método de sustitución o eliminación. Si tomamos la primera ecuación \( x + 2y = 5 \), despejamos \( x \): \( x = 5 - 2y \). Luego, sustituimos este valor en la segunda ecuación \( 3x - 4y = 2 \): \[ 3(5 - 2y) - 4y = 2 \] \[ 15 - 6y - 4y = 2 \] \[ 15 - 10y = 2 \] Ahora resolvemos para \( y \): \[ -10y = 2 - 15 \] \[ -10y = -13 \] \[ y = \frac{13}{10} = 1.3 \] El valor de \( y \) es \( 1.3 \). ¡Ya lo tienes!

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