$\"\"$

\

Observe the graph, the line passes through $\"\"$ , $\"\"$ .

\

The formula for slope is $\"\"$ .

\

Substitute $\"\"$ for $\"\"$ , $\"\"$ for $\"\"$ , $\"\"$ for $\"\"$ and $\"\"$ for $\"\"$ in above formula.

\

$\"\"$

\

$\"\"$

\

The slope $\"\"$ . $\"\"$

\

Point-Slope form of the line equation is $\"\"$ .

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$ .

\

$\"\"$

\

The line equation is $\"\"$ .