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\( \frac { | 2 x + y - 3 | } { \sqrt { 5 } } = \frac { | x - 2 y + 16 | } { \sqrt { 5 } } \)

Ask by Christensen Fernandez. in Spain
Mar 08,2025

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Las soluciones son todas las parejas de números reales \((x, y)\) que satisfacen las ecuaciones \(x + 3y = 19\) o \(y = 3x + 13\).

Solution

1. Multiplicamos ambos lados por \(\sqrt{5}\) para eliminar los denominadores: \[ |2x + y - 3| = |x - 2y + 16| \] 2. Recordamos que si \(|A| = |B|\), entonces \(A = B\) o \(A = -B\). Se analizarán ambos casos. 3. **Caso 1:** Se igualan las expresiones sin el valor absoluto: \[ 2x + y - 3 = x - 2y + 16 \] Restamos \(x\) y sumamos \(2y\) a ambos lados: \[ (2x - x) + (y + 2y) - 3 = 16 \] \[ x + 3y - 3 = 16 \] Sumamos 3 a ambos lados: \[ x + 3y = 19 \] Esta es la ecuación de una recta: \(\{(x,y) \in \mathbb{R}^2 : x + 3y = 19\}\). 4. **Caso 2:** Se iguala la expresión del lado izquierdo con el opuesto del lado derecho: \[ 2x + y - 3 = -(x - 2y + 16) \] Distribuimos el signo negativo en el lado derecho: \[ 2x + y - 3 = -x + 2y - 16 \] Sumamos \(x\) a ambos lados: \[ 3x + y - 3 = 2y - 16 \] Restamos \(y\) de ambos lados: \[ 3x - 3 = y - 16 \] Sumamos 16 a ambos lados: \[ 3x + 13 = y \] Esta es la ecuación de otra recta: \(\{(x,y) \in \mathbb{R}^2 : y = 3x + 13\}\). 5. **Conclusión:** El conjunto solución del problema es la unión de las dos rectas: \[ \{(x,y) \in \mathbb{R}^2 : x + 3y = 19\} \cup \{(x,y) \in \mathbb{R}^2 : y = 3x + 13\} \]

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To solve the equation \( \frac { | 2 x + y - 3 | } { \sqrt { 5 } } = \frac { | x - 2 y + 16 | } { \sqrt { 5 } } \), we can simplify this by multiplying both sides by \( \sqrt{5} \), leading us to: \[ |2x + y - 3| = |x - 2y + 16|. \] This absolute value equation can be split into two cases to eliminate the absolute values. **Case 1:** \[ 2x + y - 3 = x - 2y + 16. \] Rearranging gives: \[ 2x - x + y + 2y = 16 + 3, \] \[ x + 3y = 19. \quad (1) \] **Case 2:** \[ 2x + y - 3 = -(x - 2y + 16). \] Rearranging gives: \[ 2x + y - 3 = -x + 2y - 16, \] \[ 2x + x - 2y = -16 + 3, \] \[ 3x - 2y = -13. \quad (2) \] Now we have two equations to solve: 1. \( x + 3y = 19 \) 2. \( 3x - 2y = -13 \) We can solve these simultaneously. If we rearrange equation (1): \[ x = 19 - 3y \] Now, substitute \( x \) in equation (2): \[ 3(19 - 3y) - 2y = -13, \] \[ 57 - 9y - 2y = -13, \] \[ -11y = -13 - 57, \] \[ -11y = -70, \] \[ y = \frac{70}{11}. \] Substituting \( y \) back into \( x = 19 - 3y \): \[ x = 19 - 3\left(\frac{70}{11}\right), \] \[ x = 19 - \frac{210}{11}, \] \[ x = \frac{209}{11} - \frac{210}{11}, \] \[ x = -\frac{1}{11}. \] Thus, the solution to the system is: \[ \left( x, y \right) = \left(-\frac{1}{11}, \frac{70}{11}\right). \]

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