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 (5th Edition)
by Alexander, Daniel C.; Koeberlein, Geralyn M.
Published by
Brooks Cole
ISBN 10:
1439047901
ISBN 13:
978-1-43904-790-3
Chapter 2 - Section 2.3 - Proving Lines Parallel - Exercises - Page 91: 6
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