Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)

Published by Pearson
ISBN 10: 0-32193-104-1
ISBN 13: 978-0-32193-104-7

Chapter F - Foundations: A Prelude to Functions - Section F.3 Lines - F.2 Assess Your Understanding - Page 33: 137

Answer

Not all lines have one $x$-intercept and one $y$-intercept. A vertical line can have no $y$-intercept while a horizontal could have no $x$-intercept All lines have at least one intercept. Thus, there are no lines with no intercepts.

Work Step by Step

A vertical line for example either has no $y$-intercepts or an infinite number of $y$-intercepts (if the line is the $y$-axis itself). The same can be said about a horizontal line. It either has no $x$-intercept or an infinite number of $x$-intercepts (if the line is the $x$-axis itself. Therefore not all lines have exactly one $x$ and $y$-intercept. However, there is no line that hasn't got any intercepts, as the lines should intersect either the $y$-axis or the $x$-axis. Thus, all lines have at least one intercept.
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