Answer
$y = 32$
Work Step by Step
$m = (0.5)(x-y)$
$23 = (0.5)(78-y)$
$23 = 39 - \frac{1}{2}y$
$23 = 39 - \frac{y}{2}$
$-16 = - \frac{y}{2}$
$16 = \frac{y}{2}$
$y = 16 \times 2$
$y = 32$
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: 35
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