Answer
Line $\overline{AB}$ is where planes M and N intersect.
Work Step by Step
Two planes can intersect at exactly one line. If the points within a line fall on both planes then this line is where the planes intersect.
Elementary Geometry for College Students (5th Edition)
by Alexander, Daniel C.; Koeberlein, Geralyn M.
Published by
Brooks Cole
ISBN 10:
1439047901
ISBN 13:
978-1-43904-790-3
Chapter 1 - Section 1.3 - Early Definitions and Postulates - Exercises - Page 29: 23
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