Find the values of dz/ôx and az/ðy at the points 31. z - xy + yz + y -2 = 0, (1, 1, 1)

Calculus: Early Transcendentals
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ISBN:9781285741550
Author:James Stewart
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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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Please help with #31. Thank you! 

### Exercise Solutions: Partial Derivatives

#### Find the values of ∂z/∂x and ∂z/∂y at the points in Exercises 31–34.

**31.**
\[ z^3 - xy + yz + y^3 - 2 = 0, \quad (1, 1, 1) \]

**32.**
\[ \frac{1}{x} + \frac{1}{y} + \frac{1}{z} - 1 = 0, \quad (2, 3, 6) \]

**33.**
\[ \sin(x + y) + \sin(y + z) + \sin(x + z) = 0, \quad \left( \pi, \pi, \pi \right) \]

**34.**
\[ xe^y + ye^z + 2 \ln x - 2 - 3 \ln 2 = 0, \quad \left(1, \ln 2, \ln 3 \right) \]

These exercises involve finding the values of the partial derivatives ∂z/∂x and ∂z/∂y for given functions at specified points. 

#### Detailed Steps and Explanation:
To solve for \(\frac{\partial z}{\partial x}\) and \(\frac{\partial z}{\partial y}\), one must use implicit differentiation on the given functions. By taking the partial derivatives and solving the system of equations, we can find the required derivatives at the given points.

For each function:

1. **Implicitly differentiate** the equation with respect to \(x\) to get the expression for \(\frac{\partial z}{\partial x}\).
2. **Implicitly differentiate** the equation with respect to \(y\) to get the expression for \(\frac{\partial z}{\partial y}\).
3. Substitute the given points into these expressions to obtain the specific values.

Each function involves different types of terms (polynomials, trigonometric functions, logarithmic and exponential functions), which illustrates a variety of techniques and rules in differentiation. The given points simplify the problem by providing specific values where these derivatives are to be evaluated. 

**Note:**
This summary does not include the detailed steps of differentiation, which are recommended to be performed separately for accurate results.
Transcribed Image Text:### Exercise Solutions: Partial Derivatives #### Find the values of ∂z/∂x and ∂z/∂y at the points in Exercises 31–34. **31.** \[ z^3 - xy + yz + y^3 - 2 = 0, \quad (1, 1, 1) \] **32.** \[ \frac{1}{x} + \frac{1}{y} + \frac{1}{z} - 1 = 0, \quad (2, 3, 6) \] **33.** \[ \sin(x + y) + \sin(y + z) + \sin(x + z) = 0, \quad \left( \pi, \pi, \pi \right) \] **34.** \[ xe^y + ye^z + 2 \ln x - 2 - 3 \ln 2 = 0, \quad \left(1, \ln 2, \ln 3 \right) \] These exercises involve finding the values of the partial derivatives ∂z/∂x and ∂z/∂y for given functions at specified points. #### Detailed Steps and Explanation: To solve for \(\frac{\partial z}{\partial x}\) and \(\frac{\partial z}{\partial y}\), one must use implicit differentiation on the given functions. By taking the partial derivatives and solving the system of equations, we can find the required derivatives at the given points. For each function: 1. **Implicitly differentiate** the equation with respect to \(x\) to get the expression for \(\frac{\partial z}{\partial x}\). 2. **Implicitly differentiate** the equation with respect to \(y\) to get the expression for \(\frac{\partial z}{\partial y}\). 3. Substitute the given points into these expressions to obtain the specific values. Each function involves different types of terms (polynomials, trigonometric functions, logarithmic and exponential functions), which illustrates a variety of techniques and rules in differentiation. The given points simplify the problem by providing specific values where these derivatives are to be evaluated. **Note:** This summary does not include the detailed steps of differentiation, which are recommended to be performed separately for accurate results.
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