Calculus: Early Transcendentals
8th Edition
ISBN:9781285741550
Author:James Stewart
Publisher:James Stewart
Chapter1: Functions And Models
Section: Chapter Questions
Problem 1RCC: (a) What is a function? What are its domain and range? (b) What is the graph of a function? (c) How...
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Transcribed Image Text:**Direction Field Identification for Differential Equations**
*Educational Content for Understanding Differential Equations and Direction Fields*
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**Description:**
This lesson is designed to help students understand how to determine which differential equation corresponds to a given direction field. The image shows a direction field composed of short line segments, symbolizing the slopes of solutions to a differential equation at various points on the xy-plane.
**Diagram Explanation:**
The direction field illustrated in the diagram consists of small red lines representing the slope of the solution curve of a differential equation at the specific points on the plane. The field is plotted with respect to the coordinate axes marked from -2 to 2 on both the x-axis and y-axis.
---
**Problem:**
Identify which of the following differential equations would produce the direction field depicted in the above diagram:
1. \( \frac{dy}{dx} = x^2 \cdot y^2 \)
2. \( \frac{dy}{dx} = x \cdot y^2 \)
3. \( \frac{dy}{dx} = x \cdot y \)
4. \( \frac{dy}{dx} = x^2 \cdot y \)
(A) \( \frac{dy}{dx} = x^2 \cdot y^2 \)
(B) \( \frac{dy}{dx} = x \cdot y^2 \)
(C) \( \frac{dy}{dx} = x \cdot y \)
(D) \( \frac{dy}{dx} = x^2 \cdot y \)
---
**Objective:**
Students are expected to analyze the provided direction field and determine which proposed differential equation matches the given field.
**Methodology:**
1. **Analyze the Given Direction Field:**
Observe the pattern of the slopes across different regions of the plane. This includes recognizing how the slopes change as you move along the x-axis and y-axis.
2. **Compare to Differential Equations:**
- For \( \frac{dy}{dx} = x^2 \cdot y^2 \): Check if the slope is positive and increasing in proportion to \( x^2 \) and \( y^2 \).
- For \( \frac{dy}{dx} = x \cdot y^2 \): Observe if the dependency is more on y squared and linearly on x.
- For \( \frac{dy}{dx} = x
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