Match a linear system -2 with one of the phase plane direction fields below: A B C D (The blue lines are the arrow shafts, and the black dots are the arrow tips.) Note: To solve this problem, you only need to compute eigenvalues. In fact, it is enough to just compute whether the eigenvalues are real or complex and positive or negative. If you se Trace-Determinant plane, give a brief explanation about eigenvalues. CS Scanned with CamScanner

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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### Matching a Linear System

To match the linear system with one of the phase plane direction fields below, consider the following system:

\[ 
\mathbf{x'} = \begin{bmatrix} -2 & -1 \\ 5 & 0 \end{bmatrix} \mathbf{x} 
\]

#### Phase Plane Direction Fields

Below are four phase plane direction fields labeled A, B, C, and D, each representing different behaviors of the system. The axes are labeled as \( x_1 \) and \( x_2 \).

**Field A:**  
- Arrows suggest motion along a particular trajectory.
- Possible focus/spiral pattern.

**Field B:**  
- Arrows indicate radial patterns.
- May suggest node or saddle behavior.

**Field C:**  
- Arrows show movement smoothly converging or diverging.
- Possible stable or unstable node.

**Field D:**  
- Circular or spiral patterns, suggesting a focus.

#### Explanation of the Graphs

- The plots use blue lines to represent arrow shafts, indicating direction of movement, while black dots highlight arrow tips.

#### Note

To solve the problem of matching the system to a field, it is crucial to compute eigenvalues. Knowing whether these eigenvalues are real or complex, and positive or negative, can guide the matching. Utilizing the Trace-Determinant plane can provide further insight. When doing so, a brief explanation about eigenvalues would be beneficial. Eigenvalues help determine the stability and type of fixed points in the system, which is pivotal in matching the system to the correct phase plane direction field.
Transcribed Image Text:### Matching a Linear System To match the linear system with one of the phase plane direction fields below, consider the following system: \[ \mathbf{x'} = \begin{bmatrix} -2 & -1 \\ 5 & 0 \end{bmatrix} \mathbf{x} \] #### Phase Plane Direction Fields Below are four phase plane direction fields labeled A, B, C, and D, each representing different behaviors of the system. The axes are labeled as \( x_1 \) and \( x_2 \). **Field A:** - Arrows suggest motion along a particular trajectory. - Possible focus/spiral pattern. **Field B:** - Arrows indicate radial patterns. - May suggest node or saddle behavior. **Field C:** - Arrows show movement smoothly converging or diverging. - Possible stable or unstable node. **Field D:** - Circular or spiral patterns, suggesting a focus. #### Explanation of the Graphs - The plots use blue lines to represent arrow shafts, indicating direction of movement, while black dots highlight arrow tips. #### Note To solve the problem of matching the system to a field, it is crucial to compute eigenvalues. Knowing whether these eigenvalues are real or complex, and positive or negative, can guide the matching. Utilizing the Trace-Determinant plane can provide further insight. When doing so, a brief explanation about eigenvalues would be beneficial. Eigenvalues help determine the stability and type of fixed points in the system, which is pivotal in matching the system to the correct phase plane direction field.
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