Answer
See solution and image
Work Step by Step
The set is not closed under scalar multiples. A negative scalar multiple of any vector not lying on the blue boundary line will not be in H.
Linear Algebra and Its Applications (5th Edition)
by Lay, David C.; Lay, Steven R.; McDonald, Judi J.
Published by
Pearson
ISBN 10:
032198238X
ISBN 13:
978-0-32198-238-4
Chapter 2 - Matrix Algebra - 2.8 Exercises - Page 153: 4
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