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\( \left. \begin{array} { l l l l l l l l } { 91 } & { y = - x + \frac { 7 } { 8 } } & { } & { } & { } & { - } & { 1 } \\ { x } & { - 3 } & { - 2 } & { - 1 } & { 0 } & { 1 } & { 2 } & { 3 } \end{array} \right. \)

Ask by Martin Bolton. in Colombia
Mar 16,2025

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Answer

| \( x \) | \( y \) | |---------|---------| | \(-3\) | \(\frac{31}{8}\) | | \(-2\) | \(\frac{23}{8}\) | | \(-1\) | \(\frac{15}{8}\) | | \(0\) | \(\frac{7}{8}\) | | \(1\) | \(-\frac{1}{8}\) | | \(2\) | \(-\frac{9}{8}\) | | \(3\) | \(-\frac{17}{8}\)|

Solution

Consideremos la función lineal \[ y = -x + \frac{7}{8} \] y evaluémosla para cada uno de los valores de \( x \) en la siguiente lista: \(-3, -2, -1, 0, 1, 2, 3\). **Para \( x = -3 \):** \[ y = -(-3) + \frac{7}{8} = 3 + \frac{7}{8} \] Para expresar \(3\) como fracción con denominador \(8\): \[ 3 = \frac{24}{8} \] Entonces, \[ y = \frac{24}{8} + \frac{7}{8} = \frac{31}{8} \] --- **Para \( x = -2 \):** \[ y = -(-2) + \frac{7}{8} = 2 + \frac{7}{8} \] Expresando \(2\) como fracción: \[ 2 = \frac{16}{8} \] Así, \[ y = \frac{16}{8} + \frac{7}{8} = \frac{23}{8} \] --- **Para \( x = -1 \):** \[ y = -(-1) + \frac{7}{8} = 1 + \frac{7}{8} \] Expresando \(1\) como fracción: \[ 1 = \frac{8}{8} \] Por lo tanto, \[ y = \frac{8}{8} + \frac{7}{8} = \frac{15}{8} \] --- **Para \( x = 0 \):** \[ y = -(0) + \frac{7}{8} = 0 + \frac{7}{8} = \frac{7}{8} \] --- **Para \( x = 1 \):** \[ y = -(1) + \frac{7}{8} = -1 + \frac{7}{8} \] Expresando \(-1\) con denominador \(8\): \[ -1 = -\frac{8}{8} \] Entonces, \[ y = -\frac{8}{8} + \frac{7}{8} = -\frac{1}{8} \] --- **Para \( x = 2 \):** \[ y = -(2) + \frac{7}{8} = -2 + \frac{7}{8} \] Expresando \(-2\) como fracción: \[ -2 = -\frac{16}{8} \] Por lo tanto, \[ y = -\frac{16}{8} + \frac{7}{8} = -\frac{9}{8} \] --- **Para \( x = 3 \):** \[ y = -(3) + \frac{7}{8} = -3 + \frac{7}{8} \] Expresando \(-3\) como fracción: \[ -3 = -\frac{24}{8} \] Entonces, \[ y = -\frac{24}{8} + \frac{7}{8} = -\frac{17}{8} \] --- A continuación, se muestra una tabla resumen de los resultados: | \( x \) | \( y \) | |---------|-----------------------------------| | \(-3\) | \(\frac{31}{8}\) | | \(-2\) | \(\frac{23}{8}\) | | \(-1\) | \(\frac{15}{8}\) | | \(0\) | \(\frac{7}{8}\) | | \(1\) | \(-\frac{1}{8}\) | | \(2\) | \(-\frac{9}{8}\) | | \(3\) | \(-\frac{17}{8}\) |

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The Deep Dive

To solve the equation \( y = -x + \frac{7}{8} \), you can graph it. The slope of -1 means that for every unit increase in \( x \), \( y \) decreases by 1 unit. It intercepts the y-axis at \( \frac{7}{8} \), which is just slightly under 1. Drawing this line on a coordinate plane will help visualize how it descends as \( x \) increases. In real-world situations, equations like this can model various relationships, such as supply and demand where one variable inversely affects another. Understanding this relationship can help in fields like economics—predicting trends based on price changes. Using the equation, businesses can adjust their strategies based on the predicted results of price changes on sales or inventory levels!

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