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3.- El valor de x en la siguiente ecuación es... \[ \frac{x+1}{3}=\frac{x+3}{4} \]

Ask by Bird Wheeler. in Mexico
Mar 12,2025

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Answer

El valor de \( x \) es 5.

Solution

1. Planteamos la ecuación: \[ \frac{x+1}{3}=\frac{x+3}{4} \] 2. Multiplicamos ambos lados por el mínimo común denominador, \( 12 \), para eliminar fracciones: \[ 12 \cdot \frac{x+1}{3} = 12 \cdot \frac{x+3}{4} \] 3. Simplificamos cada término: \[ 4(x+1) = 3(x+3) \] 4. Expandimos ambos lados: \[ 4x + 4 = 3x + 9 \] 5. Restamos \( 3x \) de ambos lados para agrupar las incógnitas: \[ 4x - 3x + 4 = 9 \] \[ x + 4 = 9 \] 6. Restamos \( 4 \) de ambos lados para despejar \( x \): \[ x = 9 - 4 \] 7. Finalmente, obtenemos: \[ x = 5 \]

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Para resolver la ecuación \(\frac{x+1}{3}=\frac{x+3}{4}\), empieza multiplicando ambos lados por 12, que es el mínimo común múltiplo de 3 y 4. Esto nos da: \[ 4(x+1) = 3(x+3) \] Ahora desarrolla ambos lados de la ecuación: \[ 4x + 4 = 3x + 9 \] Luego, resta \(3x\) de ambos lados: \[ 4x - 3x + 4 = 9 \] Esto simplifica a: \[ x + 4 = 9 \] Finalmente, resta 4 de ambos lados: \[ x = 5 \] Por lo tanto, el valor de \(x\) es 5.

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