Answer
b=4.5
Work Step by Step
Since Y is the midpoint, $XY\cong YZ$.
$2b-1=26-4b$
add 4b to each side
$2b-1+4b=26-4b+4b$
$6b-1=26$
add 1 to each side
$6b-1+1=26+1$
$6b=27$
divide each side by 6
$6b\div6=27\div6$
$b=4.5$
Geometry: Common Core (15th Edition)
by Charles, Randall I.
Published by
Prentice Hall
ISBN 10:
0133281159
ISBN 13:
978-0-13328-115-6
Chapter 1 - Tools of Geometry - Common Core Cumulative Standards Review - Selected Response - Page 78: 16
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