Answer
y=-3
Work Step by Step
We add $4y$ to both sides:
$3y + 4y = 7y = -21$
We divide both sides by 7:
$y = -21\div 7 = -3$
Elementary Geometry for College Students (7th Edition)
by Alexander, Daniel C.; Koeberlein, Geralyn M.
Published by
Cengage
ISBN 10:
978-1-337-61408-5
ISBN 13:
978-1-33761-408-5
Appendix A - A.2 - Formulas and Equations - Exercises - Page 546: 24
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