Chapter 1 - Linear Functions - 1.1 Slopes and Equations of Lines - 1.1 Exercises - Page 13: 9

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Work Step by Step

$x=5$ is a vertical line. The slope of a line is defined as the change in y divided by the change in x: $$m=\frac{\Delta y}{\Delta x}$$ Since $\Delta x=0$ for all vertical lines, the slope $m$ is undefined.

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