\"\"

\

\

Slope of the two non vertical lines is \"\"

\

The y-coordinate are same. So, the line is y = -3. The line is horizontal line.

\

So, slope is zero.

\

\"\"

\

Check the solution by substituting the values.

\

Replace \"\" in slope formula.

\

\"\"        

\

\"\"                        (Subtract:\"\")

\

\"\"                                    (Subtract: \"\")

\

\"\"                                     (Divide: \"\")

\

 \"\"

\

Slope is zero.

\