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Solve the following compound inequality. Write the solution set using interval notation and graph it. \[ \begin{array}{l}1-x<7+x \text { or } 7 x+6>x\end{array} \]

Ask by Wang Murphy. in the United States
Jan 23,2025

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The solution set is \(x > -3\), which in interval notation is \((-3, \infty)\).

Solución

To solve the compound inequality: \[ \begin{array}{l} 1 - x < 7 + x \quad \text{or} \quad 7x + 6 > x \end{array} \] we'll solve each inequality separately and then combine their solutions using the **OR** condition. ### Solving the First Inequality: \(1 - x < 7 + x\) 1. **Subtract 1 from both sides:** \[ -x < 6 + x \] 2. **Subtract \(x\) from both sides:** \[ -2x < 6 \] 3. **Divide both sides by \(-2\) (remember to reverse the inequality sign when dividing by a negative number):** \[ x > -3 \] **Solution for the first inequality:** \(x > -3\) --- ### Solving the Second Inequality: \(7x + 6 > x\) 1. **Subtract \(x\) from both sides:** \[ 6x + 6 > 0 \] 2. **Subtract 6 from both sides:** \[ 6x > -6 \] 3. **Divide both sides by 6:** \[ x > -1 \] **Solution for the second inequality:** \(x > -1\) --- ### Combining the Solutions Since the compound inequality uses **OR**, we take the **union** of the two solution sets: - \(x > -3\) **OR** \(x > -1\) The union of these two conditions is simply \(x > -3\), because any \(x\) that satisfies \(x > -1\) also satisfies \(x > -3\). ### Final Solution - **Interval Notation:** \((-3, \infty)\) - **Graph:** ![Graph of x > -3](https://i.imgur.com/CfGY8sD.png) - An open circle is placed at \(-3\). - A shaded line extends to the right from \(-3\) towards infinity.

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To solve the given compound inequality \(1-x<7+x \text{ or } 7x+6>x\), we will solve each part separately. First, solve the inequality \(1-x < 7+x\): 1. Add \(x\) to both sides: \[ 1 < 7 + 2x \] 2. Subtract \(7\) from both sides: \[ -6 < 2x \] 3. Divide by \(2\): \[ -3 < x \] or equivalently, \[ x > -3 \] Now, let's solve the second inequality \(7x + 6 > x\): 1. Subtract \(x\) from both sides: \[ 7x - x + 6 > 0 \] \[ 6x + 6 > 0 \] 2. Subtract \(6\) from both sides: \[ 6x > -6 \] 3. Divide by \(6\): \[ x > -1 \] Now, we combine the two parts of the compound inequality. Since we have "or," we take the union of the two intervals: From \(x > -3\), we have the interval \((-3, \infty)\). From \(x > -1\), we have the interval \((-1, \infty)\). The union of these two intervals is: \[ (-3, \infty) \cup (-1, \infty) = (-3, \infty) \] because \(-1\) is greater than \(-3\), and thus it essentially encompasses all values greater than \(-3\). The solution set in interval notation is: \[ (-3, \infty) \] Graphically, this would be represented on a number line with an open circle at \(-3\) and an arrow extending to the right, indicating all values greater than \(-3\).

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