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 74: 35



Work Step by Step

use the midpoint formula $M_x=\frac{x_1+x_2}{2}$ substitute $-1=\frac{-8+x_2}{2}$ multiply both sides by 2 $-1\times2=\frac{-8+x_2}{2}\times2$ $-2=-8+x_2$ add 8 to each side $-2+8=-8+x_2+8$ simplify $6=x_2$ $M_y=\frac{y_1+y_2}{2}$ substitute $1=\frac{4+y_2}{2}$ multiply both sides by 2 $1\times2=\frac{4+y_2}{2}\times2$ $2=4+y_2$ subtract 4 from each side $2-4=4+y_2-4$ simplify $-2=y_2$
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