$\"\"$

\

\

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

\

Replace $\"\"$ in slope formula.

\

$\"\"$

\

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

\

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

\

$\"\"$ \ \

\

$\"\"$

\

Slope $\"\"$

\