In the graph of the function z = f(x, y) below, which of the following statements is true about the slope of the tangent line shown? (A) The slope is given by f, (1,2) and is positive. (B) The slope is given by f, (1,2) and is negative. (C) The slope is given by f (1,2) and is positive. (D) The slope is given by f (1,2) and is negative. (E) The slope is given by f (1,2) and is positive. (F) The slope is given by f₂ (1,2) and is negative. x 2 16 (1,2,8) (1,2)

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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**Text Transcription:**

In the graph of the function \( z = f(x, y) \) below, which of the following statements is true about the slope of the tangent line shown?

(A) The slope is given by \( f_y(1,2) \) and is positive.

(B) The slope is given by \( f_y(1,2) \) and is negative.

(C) The slope is given by \( f_x(1,2) \) and is positive.

(D) The slope is given by \( f_x(1,2) \) and is negative.

(E) The slope is given by \( f_z(1,2) \) and is positive.

(F) The slope is given by \( f_z(1,2) \) and is negative.

---

**Diagram Explanation:**

The diagram is a three-dimensional graph featuring three axes labeled \( x \), \( y \), and \( z \). It illustrates a surface formed by the function \( z = f(x, y) \). The surface is intersected by a tangent line at the point labeled \( (1,2,8) \).

- The \( x \)-axis is marked with values from 0 to 4.
- The \( y \)-axis extends perpendicularly to the \( x \)-axis, with points at 1 and 2 highlighted.
- The \( z \)-axis is vertical, with a value of 16 at the top.
- The tangent line intersects the surface at the point \( (1,2,8) \).
- Another point, labeled \( (1,2) \), is shown on the \( xy \)-plane as a reference.
- A curve, \( C_1 \), depicts the path of the function on the plane.

The diagram aids in visualizing the slope and direction of the tangent line relative to the axes.
Transcribed Image Text:**Text Transcription:** In the graph of the function \( z = f(x, y) \) below, which of the following statements is true about the slope of the tangent line shown? (A) The slope is given by \( f_y(1,2) \) and is positive. (B) The slope is given by \( f_y(1,2) \) and is negative. (C) The slope is given by \( f_x(1,2) \) and is positive. (D) The slope is given by \( f_x(1,2) \) and is negative. (E) The slope is given by \( f_z(1,2) \) and is positive. (F) The slope is given by \( f_z(1,2) \) and is negative. --- **Diagram Explanation:** The diagram is a three-dimensional graph featuring three axes labeled \( x \), \( y \), and \( z \). It illustrates a surface formed by the function \( z = f(x, y) \). The surface is intersected by a tangent line at the point labeled \( (1,2,8) \). - The \( x \)-axis is marked with values from 0 to 4. - The \( y \)-axis extends perpendicularly to the \( x \)-axis, with points at 1 and 2 highlighted. - The \( z \)-axis is vertical, with a value of 16 at the top. - The tangent line intersects the surface at the point \( (1,2,8) \). - Another point, labeled \( (1,2) \), is shown on the \( xy \)-plane as a reference. - A curve, \( C_1 \), depicts the path of the function on the plane. The diagram aids in visualizing the slope and direction of the tangent line relative to the axes.
Expert Solution
Introduction

As per the question we are given the grh of a 3d surface defined by the equation :

z = f(x,y)

And in the figure we are given a point (1,2) on the xy-plane and it's corresponding image point (1,2,8) on the surface. At that point on the surface a level curve C1 is taken and a tangent line is drawn on the curve at that point.

Now we have to find the correct option regarding the slope of that tangent line and whether it is negative or positive.

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