Thomas' Calculus 13th Edition

Published by Pearson
ISBN 10: 0-32187-896-5
ISBN 13: 978-0-32187-896-0

Appendices - Section A.3 - Lines, Circles, and Parabolas - Exercises A.3 - Page AP-17: 12



Work Step by Step

A line with slope 0 is horizontal. Horizontal lines contain points $(x,y)$ that all have the same y-coordinate. Given that $(-12,-9)$ lies on the line and has its y-coordinate equal to $-9$, the horizontal line has the equation: $y=-9$
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