Linear Algebra: A Modern Introduction

Published by Cengage Learning
ISBN 10: 1285463242
ISBN 13: 978-1-28546-324-7

Chapter 1 - Vectors - 1.3 Lines and Planes - Exercises 1.3 - Page 44: 8

Answer

Normal form of the plane:$\begin{bmatrix}{2 \\5\\0}\end{bmatrix} \cdot \begin{bmatrix}{x-3 \\y\\z+2}\end{bmatrix}=0$; General form of the equation of the plane: $2x+5y=6$

Work Step by Step

The normal form of a plane is: $n \cdot (x-p)=0$ and $n=\begin{bmatrix}{a \\b\\c}\end{bmatrix}$ Here: $a=2, b=5,c=0$ Now, the normal form of the plane is:$\begin{bmatrix}{2 \\5\\0}\end{bmatrix} \cdot \begin{bmatrix}{x-3 \\y\\z+2}\end{bmatrix}=0$ The general form of equation of a plane is: $ax+by+cz=d$ Thus, the General form of the equation of a plane is: $2x+5y=d$ or, $2(3)+5(0)+0=d \implies d=6$ Hence, the normal form of the plane is: $\begin{bmatrix}{2 \\5\\0}\end{bmatrix} \cdot \begin{bmatrix}{x-3 \\y\\z+2}\end{bmatrix}=0$; Thus, the General form of the equation of a plane is: $2x+5y=6$
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