Answer
Always
Work Step by Step
A vertical line has the equation $x=k$, where $k$ is constant. All vertical lines are parallel. The $y$-axis has the equation $x=0$, therefore it is a vertical line. So the given statement is ALWAYS true.
Big Ideas Math - Algebra 1, A Common Core Curriculum
by Larson, Ron; Boswell, Laurie
Published by
Big Ideas Learning LLC
ISBN 10:
978-1-60840-838-2
ISBN 13:
978-1-60840-838-2
Chapter 4 - Writing Linear Functions - 4.3 - Writing Equations of Parallel and Perpendicular Lines - Exercises - Page 192: 34
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