$\"\"$

Observe the graph :

The vertex is $\"\"$ .

The directrix is $\"\"$ .

Since the directrix is $\"\"$ , the graph opens horizontally.

Standard form of the horizontal parabola is $\"\"$ ,

where $\"\"$ is vertex.

Focus $\"\"$ .

Directrix $\"\"$ .

$\"\"$

The vertex is $\"\"$ .

Directrix is $\"\"$ .

Compare directrix with $\"\"$ .

$\"\"$

$\"\"$ .

Substitute $\"\"$ and $\"\"$ in $\"\"$ .

$\"\"$

$\"\"$ .

$\"\"$

The equation of parabola is $\"\"$ .