Answer
$\triangle$ABC is equilateral.
Work Step by Step
BC=AC
3y+5=9-y
4y=4
y=1
BC=3y+5
BC=3(1)+5
BC=8
AC=9-y
AC=9-1
AC=8
AB=y+7
AB=1+7
AB=8
Elementary Geometry for College Students (5th Edition)
by Alexander, Daniel C.; Koeberlein, Geralyn M.
Published by
Brooks Cole
ISBN 10:
1439047901
ISBN 13:
978-1-43904-790-3
Chapter 3 - Review Exercises - Page 174: 25
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