Elementary Geometry for College Students (5th Edition)

Published by Brooks Cole
ISBN 10: 1439047901
ISBN 13: 978-1-43904-790-3

Appendix A - A.2 - Formulas and Equations - Exercises - Page 549: 24

Answer

y=-3

Work Step by Step

We add $4y$ to both sides: $3y + 4y = 7y = -21$ We divide both sides by 7: $y = -21\div 7 = -3$
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