Pregunta
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Find the value of \( x \) from each of the following. \( \begin{array}{lll}\text { (a) } x+5=8 & \text { (b) } 2-x=3 & \text { (c) } \frac{x}{3}=-2 \\ \text { (d) } \frac{15}{x}=5 & \text { (e) } 2 x=8 & \text { (f) } 16=4 x \\ \text { (g) } \frac{x}{3}=\frac{2}{9} & \text { (h) } \frac{x}{5}=\frac{1}{2} & \text { (i) } \frac{x+2}{12}=1 \\ \text { section } B & \end{array} \)

Ask by Pollard Pearson. in Nepal
Feb 16,2025

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The values of \( x \) are: (a) 3, (b) -1, (c) -6, (d) 3, (e) 4, (f) 4, (g) \( \frac{2}{3} \), (h) \( \frac{5}{2} \), (i) 10.

Solución

Here is the step-by-step solution for each equation: (a) x + 5 = 8 Subtract 5 from both sides to isolate x:   x = 8 - 5 = 3 (b) 2 - x = 3 Subtract 2 from both sides:   -x = 3 - 2   -x = 1 Multiply by -1 to solve for x:   x = -1 (c) x/3 = -2 Multiply both sides by 3:   x = -2 × 3 = -6 (d) 15/x = 5 Multiply both sides by x to eliminate the denominator:   15 = 5x Now divide both sides by 5:   x = 15/5 = 3 (e) 2x = 8 Divide both sides by 2:   x = 8/2 = 4 (f) 16 = 4x Divide both sides by 4:   x = 16/4 = 4 (g) x/3 = 2/9 Multiply both sides by 3:   x = 3 × (2/9) Simplify:   x = (6/9) = 2/3 (h) x/5 = 1/2 Multiply both sides by 5:   x = 5 × (1/2) = 5/2 (i) (x + 2)/12 = 1 Multiply both sides by 12:   x + 2 = 12 Subtract 2 from both sides:   x = 12 - 2 = 10 Thus, the values of x for each part are: (a) 3, (b) -1, (c) -6, (d) 3, (e) 4, (f) 4, (g) 2/3, (h) 5/2, (i) 10.

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Extra Insights

To solve each of these equations for \( x \), let's break them down one by one: (a) \( x + 5 = 8 \) Subtracting 5 from both sides, we get \( x = 8 - 5 \) which simplifies to \( x = 3 \). (b) \( 2 - x = 3 \) Rearranging gives \( -x = 3 - 2 \), leading to \( -x = 1 \), or \( x = -1 \). (c) \( \frac{x}{3} = -2 \) Multiplying both sides by 3 results in \( x = -2 \times 3 \), so \( x = -6 \). (d) \( \frac{15}{x} = 5 \) Multiplying both sides by \( x \) gives \( 15 = 5x \). Dividing by 5 leads to \( x = 3 \). (e) \( 2x = 8 \) Dividing both sides by 2 gives \( x = \frac{8}{2} \), so \( x = 4 \). (f) \( 16 = 4x \) Dividing both sides by 4 results in \( x = 4 \). (g) \( \frac{x}{3} = \frac{2}{9} \) Multiplying both sides by 3 gives \( x = \frac{2}{9} \times 3 \), simplifying to \( x = \frac{2}{3} \). (h) \( \frac{x}{5} = \frac{1}{2} \) Multiplying both sides by 5 results in \( x = 5 \times \frac{1}{2} \), so \( x = \frac{5}{2} \) or 2.5. (i) \( \frac{x+2}{12} = 1 \) Multiplying both sides by 12 gives \( x + 2 = 12 \). Subtracting 2 leads to \( x = 10 \). Summarizing the solutions: - (a) \( x = 3 \) - (b) \( x = -1 \) - (c) \( x = -6 \) - (d) \( x = 3 \) - (e) \( x = 4 \) - (f) \( x = 4 \) - (g) \( x = \frac{2}{3} \) - (h) \( x = \frac{5}{2} \) - (i) \( x = 10 \)

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