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9. Ind a table belaw, \( y=\frac{3}{4} x \). Determine \( d \) and \( e \). \[ \begin{array}{cccccc} x & 4 & 12 & 16 & e & \\ y & 3 & 9 & d & 15 & {[4]} \end{array} \] a)* b) Is this on example of direct or indirect proportion? Give a reason for yous answer. [3] C) If you plotted the points will it be form a straight line or curve? [i]

Ask by Daniels Cole. in South Africa
Mar 13,2025

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Answer

**Simplified Answer:** - **d = 12** - **e = 20** - **This is an example of direct proportion** because \( y \) changes at a constant rate with \( x \). - **The graph of the points will form a straight line.**

Solution

**Step 1. Determine \( d \) when \( x = 16 \):** Given the equation \[ y = \frac{3}{4}x, \] substitute \( x = 16 \): \[ y = \frac{3}{4} \times 16 = 12. \] Thus, \[ d = 12. \] **Step 2. Determine \( e \) when \( y = 15 \):** Again, using \[ y = \frac{3}{4}x, \] set \( y = 15 \) and solve for \( x \) (here \( x = e \)): \[ 15 = \frac{3}{4}e. \] Multiply both sides by \(\frac{4}{3}\): \[ e = 15 \times \frac{4}{3} = 20. \] **Step 3. Answer part (b): Direct or Indirect Proportion** The equation \[ y = \frac{3}{4}x \] represents a relationship where \( y \) is directly proportional to \( x \) (i.e., \( y \) changes at a constant rate relative to \( x \) and the graph passes through the origin). Therefore, it is an example of **direct proportion**. **Step 4. Answer part (c): Graph of the points** Since the relationship \( y = \frac{3}{4}x \) is linear, plotting the points will form a **straight line**.

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To find the values for \( d \) and \( e \) using the equation \( y = \frac{3}{4} x \): 1. **For \( x = 16 \)**: \[ y = \frac{3}{4} \times 16 = 12 \implies d = 12 \] 2. **For \( y = 15 \)**: \[ 15 = \frac{3}{4} e \implies e = \frac{15 \times 4}{3} = 20 \] Thus, \( d = 12 \) and \( e = 20 \). b) This is an example of direct proportion because as \( x \) increases, \( y \) increases proportionally. The consistent ratio of \( \frac{y}{x} \) remains constant at \( \frac{3}{4} \), meaning for any increase in \( x \), \( y \) increases at a fixed rate. C) If you plotted the points, they would form a straight line. This is characteristic of direct proportional relationships. For every increase in \( x \), \( y \) increases in a constant ratio, which results in a linear graph where the slope represents that constant multiplier.

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