Question
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Shown on the right is the graph of \( y=\frac{4}{x} \). Determine its symmetries (if any). This graph is A. symmetric to the origin. B. symmetric to the \( x \)-axis. C. symmetric to the \( y \)-axis. D. not symmetric to the \( x \)-axis, \( y \)-axis, or origin.

Ask by Cross Macdonald. in the United States
Jan 25,2025

Real Tutor Solution

Tutor-Verified Answer

Answer

The graph of \( y = \frac{4}{x} \) is symmetric to the origin.

Solution

To determine the symmetries of the graph \( y = \frac{4}{x} \), let's analyze each option: **A. Symmetric to the origin.** - **Check:** A graph is symmetric to the origin if replacing \( x \) with \( -x \) and \( y \) with \( -y \) results in the same equation. \[ y = \frac{4}{x} \quad \rightarrow \quad -y = \frac{4}{-x} \quad \Rightarrow \quad -y = -\frac{4}{x} \quad \Rightarrow \quad y = \frac{4}{x} \] The equation remains unchanged, confirming symmetry about the origin. **B. Symmetric to the \( x \)-axis.** - **Check:** A graph is symmetric to the \( x \)-axis if replacing \( y \) with \( -y \) results in the same equation. \[ -y = \frac{4}{x} \quad \Rightarrow \quad y = -\frac{4}{x} \] This is a different equation, so the graph is **not** symmetric to the \( x \)-axis. **C. Symmetric to the \( y \)-axis.** - **Check:** A graph is symmetric to the \( y \)-axis if replacing \( x \) with \( -x \) results in the same equation. \[ y = \frac{4}{-x} \quad \Rightarrow \quad y = -\frac{4}{x} \] This is a different equation, so the graph is **not** symmetric to the \( y \)-axis. **D. Not symmetric to the \( x \)-axis, \( y \)-axis, or origin.** - Based on the above checks, this is incorrect because the graph **is** symmetric to the origin. **Conclusion:** The graph of \( y = \frac{4}{x} \) is **symmetric to the origin** only. **Answer:** A. symmetric to the origin.

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Bonus Knowledge

The graph of \( y = \frac{4}{x} \) exhibits symmetry about the origin. This is because if you replace \( x \) with \( -x \), you get \( y = \frac{4}{-x} = -\frac{4}{x} \), which corresponds to the point \( (-x, -y) \). This means for every point \( (x, y) \) on the graph, there’s a corresponding point \( (-x, -y) \), confirming the origin symmetry. However, the graph is not symmetric with respect to the \( x \)-axis or \( y \)-axis. If you replace \( y \) with \( -y \), you do not obtain a valid function since the result does not maintain the same relationship. Similarly, substituting \( x \) with \( -x \) does not yield the original function, which means there’s no symmetry with respect to the \( y \)-axis either. Thus, the correct answer is A: symmetric to the origin.

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