Find an equation of the plane that passes through the given point and is perpendicular to the given vector or line. Perpendicular to n = j Point (2, 5, -6)

Calculus: Early Transcendentals
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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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11.5

### Finding an Equation of a Plane

To determine the equation of a plane, we need a point through which the plane passes and a normal vector perpendicular to the plane. Here, we are given:

1. **Point**: (2, 5, -6)
2. **Normal Vector (n)**: \( \mathbf{n} = \mathbf{j} \)

The normal vector \( \mathbf{j} \) corresponds to the unit vector in the y-direction, often written as (0, 1, 0) in coordinate form.

#### Step-by-Step Solution:

1. **Identifying the Normal Vector**:
   The normal vector \( \mathbf{n} \) points in the y-direction: \( (0, 1, 0) \).

2. **Using the General Plane Equation**:
   The general form of the equation of a plane with a normal vector \((A, B, C)\) passing through a point \((x_0, y_0, z_0)\) is:
   \[
   A(x - x_0) + B(y - y_0) + C(z - z_0) = 0
   \]
   For our problem:
   \[
   \mathbf{n} = (0, 1, 0) \quad \text{and} \quad \text{Point} = (2, 5, -6)
   \]

   Substituting into the equation:
   \[
   0(x - 2) + 1(y - 5) + 0(z + 6) = 0
   \]

3. **Simplification**:
   Simplifying the above equation, we get:
   \[
   y - 5 = 0
   \]

4. **Final Equation**:
   Solving for \( y \), we get:
   \[
   y = 5
   \]

Therefore, the equation of the plane that passes through the point (2, 5, -6) and is perpendicular to the vector \( \mathbf{j} \) is:
\[
y = 5
\]

This is a horizontal plane perpendicular to the y-axis, passing through all points where \( y = 5 \).
Transcribed Image Text:### Finding an Equation of a Plane To determine the equation of a plane, we need a point through which the plane passes and a normal vector perpendicular to the plane. Here, we are given: 1. **Point**: (2, 5, -6) 2. **Normal Vector (n)**: \( \mathbf{n} = \mathbf{j} \) The normal vector \( \mathbf{j} \) corresponds to the unit vector in the y-direction, often written as (0, 1, 0) in coordinate form. #### Step-by-Step Solution: 1. **Identifying the Normal Vector**: The normal vector \( \mathbf{n} \) points in the y-direction: \( (0, 1, 0) \). 2. **Using the General Plane Equation**: The general form of the equation of a plane with a normal vector \((A, B, C)\) passing through a point \((x_0, y_0, z_0)\) is: \[ A(x - x_0) + B(y - y_0) + C(z - z_0) = 0 \] For our problem: \[ \mathbf{n} = (0, 1, 0) \quad \text{and} \quad \text{Point} = (2, 5, -6) \] Substituting into the equation: \[ 0(x - 2) + 1(y - 5) + 0(z + 6) = 0 \] 3. **Simplification**: Simplifying the above equation, we get: \[ y - 5 = 0 \] 4. **Final Equation**: Solving for \( y \), we get: \[ y = 5 \] Therefore, the equation of the plane that passes through the point (2, 5, -6) and is perpendicular to the vector \( \mathbf{j} \) is: \[ y = 5 \] This is a horizontal plane perpendicular to the y-axis, passing through all points where \( y = 5 \).
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