Chapter 9.3, Problem 20IP

To determine

To calculate: Slope of the line that passes through the given points.

Answer to Problem 20IP

Slope of the line is undefined.

Explanation of Solution

Given information:

The following points:

  $\begin{array}{l}J(-1,3)\\ K(-1,7)\end{array}$

Formula used:

Slope is given by the formula,

  $m=\frac{y_2-y_1}{x_2-x}$

where $x_2\ne x$ .

Calculation:

Slope is calculated as follows:

  $\begin{array}{l}m=\frac{y_2-y_1}{x_2-x}[\text{Definition of slope]}\\ m=\frac{7-3}{-1-(-1)}[(x_1,y_1)=(-1,3),(x_2,y_2)=(-1,7)]\\ m=\frac{4}{0}[\text{The slope is undefined]}\end{array}$