Geometry: Common Core (15th Edition)

Published by Prentice Hall
ISBN 10: 0133281159
ISBN 13: 978-0-13328-115-6

Chapter 1 - Tools of Geometry - Chapter Review - Page 73: 25



Work Step by Step

The two angles form a right angle. Angle Addition Postulate $3x+(4x-15)=90$ combine like terms $7x-15=90$ add 15 to each side $7x-15+15=90+15$ $7x=105$ divide each side by 7 $7x\div7=105\div7$ $x=15$
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