Answer
$${\text{They have the same slope.}}$$
Work Step by Step
$$\eqalign{
& {\text{Two nonvertical lines }}{\ell _1}{\text{ and }}{\ell _2}{\text{ are parallel if and only if they }} \cr
& {\text{have the same slope}}{\text{.}} \cr} $$
Calculus: Early Transcendentals (2nd Edition)
by Briggs, Bill L.; Cochran, Lyle; Gillett, Bernard
Published by
Pearson
ISBN 10:
0321947347
ISBN 13:
978-0-32194-734-5
Appendix A - Appendix A Exercises - Page 1158: 13
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