a. Find vectors nį and n2 that are normals to II and IL respectively and explain how you can tell without performing any extra calculations that Ilj and IL must intersect in a line. b. Find Cartesian equations for Пр and c. For your first method, assign one of *2 or x3 to be the parameter o and then use your two Cartesian equations for п аnd IL to express the other two variables in terms of o and hence write down a parametric vector form of the line of intersection L.

Linear Algebra: A Modern Introduction
4th Edition
ISBN:9781285463247
Author:David Poole
Publisher:David Poole
Chapter1: Vectors
Section1.3: Lines And Planes
Problem 4AEXP
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You are given two planes in parametric form,
x1
Il : x2
X1
IL : x2=|0 +41 2 + 2 4
X3
where
X1 , X2 , X3, 11 , d2,41, H2 E R. Let
L be the line of intersection of
п and
IL.
a. Find vectors
nj and
nɔ that are normals to
П and
IL respectively and explain how you can tell without performing any extra calculations that
II and
II, must intersect in a line.
b. Find Cartesian equations for
П and
IL.
c. For your first method, assign one of
X2 or
X3 to be the parameter
o and then use your two Cartesian equations for
П and
II, to express the other two variables in terms of
o and hence write down a parametric vector form of the line of intersection
L.
d. For your second method, substitute expressions for
X1 »
X and
X3 from the parametric form of
II, into your Cartesian equation for
II, and hence find a parametric vector form of the line of intersection
L.
e. If your parametric forms in parts (c) and (d) are different, check that they represent the same line. If your parametric forms in parts (c) and (d) are the same, explain how they could have
been different while still describing the same line.
f. Find
m = nj x n, and show that
m is parallel to the line you found in parts (c) and (d).
g. Give a geometric explanation of the result in part (f)
Transcribed Image Text:You are given two planes in parametric form, x1 Il : x2 X1 IL : x2=|0 +41 2 + 2 4 X3 where X1 , X2 , X3, 11 , d2,41, H2 E R. Let L be the line of intersection of п and IL. a. Find vectors nj and nɔ that are normals to П and IL respectively and explain how you can tell without performing any extra calculations that II and II, must intersect in a line. b. Find Cartesian equations for П and IL. c. For your first method, assign one of X2 or X3 to be the parameter o and then use your two Cartesian equations for П and II, to express the other two variables in terms of o and hence write down a parametric vector form of the line of intersection L. d. For your second method, substitute expressions for X1 » X and X3 from the parametric form of II, into your Cartesian equation for II, and hence find a parametric vector form of the line of intersection L. e. If your parametric forms in parts (c) and (d) are different, check that they represent the same line. If your parametric forms in parts (c) and (d) are the same, explain how they could have been different while still describing the same line. f. Find m = nj x n, and show that m is parallel to the line you found in parts (c) and (d). g. Give a geometric explanation of the result in part (f)
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