College Algebra (10th Edition)

Published by Pearson
ISBN 10: 0321979478
ISBN 13: 978-0-32197-947-6

Chapter 8 - Review Exercises - Page 634: 7

Answer

See below.

Work Step by Step

$4x+10y=20\\4x=20-10y\\x=5-2.5y$ Thus $2(5-2.5y)+5y=10\\10-5y+5y=10\\10=10$ This is always true, thus we have infinitely many solutions.
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