Question
Determine the symmetries (if any) of the graph of the given relation. \( 7 y=2 x^{2}-3 \) Choose the correct symmetry of the graph. A. It is symmetric with respect to the origin. B. It is symmetric with respect to the \( x \)-axis. C. It is symmetric with respect to the \( y \)-axis. D. It is not symmetric with respect to the \( x \)-axis, \( y \)-axis, or origin.
Ask by Gordon Washington. in the United States
Jan 25,2025
Real Tutor Solution
Tutor-Verified Answer
Answer
The graph is symmetric with respect to the \( y \)-axis.
Solution
To determine the symmetries of the graph of the relation \( 7y = 2x^2 - 3 \), let's analyze it step by step.
First, let's rewrite the equation in a more familiar form:
\[
y = \frac{2x^2 - 3}{7}
\]
This represents a parabola that opens upward with its vertex at \( (0, -\frac{3}{7}) \).
**Checking for Symmetries:**
1. **Symmetry with respect to the \( y \)-axis:**
- Replace \( x \) with \(-x\) in the equation:
\[
y = \frac{2(-x)^2 - 3}{7} = \frac{2x^2 - 3}{7} = y
\]
- Since \( y(-x) = y(x) \), the graph is symmetric with respect to the \( y \)-axis.
2. **Symmetry with respect to the \( x \)-axis:**
- Replace \( y \) with \(-y\) in the equation:
\[
-y = \frac{2x^2 - 3}{7}
\]
- This does not simplify to the original equation unless \( y = 0 \), so the graph is **not** symmetric with respect to the \( x \)-axis.
3. **Symmetry with respect to the origin:**
- Replace \( x \) with \(-x\) and \( y \) with \(-y\):
\[
-y = \frac{2(-x)^2 - 3}{7} = \frac{2x^2 - 3}{7}
\]
- This does not result in \( -y = y \) (unless \( y = 0 \)), so the graph is **not** symmetric with respect to the origin.
**Conclusion:**
The graph of \( 7y = 2x^2 - 3 \) is **symmetric with respect to the \( y \)-axis**.
**Answer:**
C. It is symmetric with respect to the \( y \)-axis.
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The Deep Dive
To determine symmetries, we can analyze the equation \( 7y = 2x^2 - 3 \). Rearranging gives \( y = \frac{2}{7}x^2 - \frac{3}{7} \), which is a parabola opening upwards. Since all terms involving \( x \) are even (the term \( x^2 \)), the graph is symmetric with respect to the \( y \)-axis. Thus, the correct answer is: C. It is symmetric with respect to the \( y \)-axis.