Answer
It cannot be confirmed that lines l and m are parallel.
Work Step by Step
You cannot say that lines l and m are parallel because the only information given is that vertical angles 6 and 7 are congruent which does not prove anything.
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
Chapter 2 - Section 2.3 - Proving Lines Parallel - Exercises - Page 100: 6
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