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Which number line represents the solution the following inequally? \[ -8 x-3<18-x \] A) B) C) \[ \begin{array}{l} \text { D) } \end{array} \] © Amazing Mathematics

Ask by Potter Reid. in the United States
Mar 10,2025

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Answer

The solution to the inequality \(-8x - 3 < 18 - x\) is \(x > -3\). On a number line, this is shown with an open circle at \(-3\) and a ray extending to the right.

Solution

1. Start with the inequality: \[ -8x - 3 < 18 - x \] 2. Add \(8x\) to both sides to eliminate the \(-8x\) term on the left: \[ -8x - 3 + 8x < 18 - x + 8x \quad \Longrightarrow \quad -3 < 18 + 7x \] 3. Subtract \(18\) from both sides to isolate the term with \(x\): \[ -3 - 18 < 18 - 18 + 7x \quad \Longrightarrow \quad -21 < 7x \] 4. Divide both sides by \(7\) (since \(7\) is positive, the inequality direction remains the same): \[ \frac{-21}{7} < x \quad \Longrightarrow \quad -3 < x \] 5. The inequality \( -3 < x \) can also be written as: \[ x > -3 \] Thus, the solution to the inequality is \( x > -3 \). On a number line, this solution is represented by an open circle at \(-3\) (indicating that \(-3\) is not included) with a ray or shading extending to the right (representing all numbers greater than \(-3\)).

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Mind Expander

To solve the inequality \(-8x - 3 < 18 - x\), we first isolate \(x\). Adding \(x\) to both sides gives us \(-8x + x < 18 + 3\), which simplifies to \(-7x < 21\). Dividing both sides by \(-7\) (remember, reversing the inequality sign) leads us to \(x > -3\). This means any number greater than \(-3\) is part of the solution, and on a number line, it would be represented with an open circle at \(-3\) and shading to the right. The key takeaway here is understanding how to reverse the inequality when dividing or multiplying by a negative number—this can trip up many budding mathematicians! Remember, always keep an eye on the sign when making those calculations. To dive deeper into inequalities, consider exploring resources that not only break down the concept with visual aids but also include practice problems to solidify your understanding. Websites like Khan Academy or educational YouTube channels often provide excellent insights and engaging explanations!

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