$\"\"$

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Observe the graph:

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The focus is $\"\"$ .

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The directrix is $\"\"$ .

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

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

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where $\"\"$ is vertex.

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Focus $\"\"$ .

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Directrix $\"\"$ .

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$\"\"$

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The focus is $\"\"$ .

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Equate $\"\"$ -coordinates.

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$\"\"$ .

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Directrix is $\"\"$ .

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Compare directrix with $\"\"$ .

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$\"\"$ .

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Add equation $\"\"$ and equation $\"\"$ .

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$\"\"$

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$\"\"$ .

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

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$ .

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The vertex is $\"\"$ .

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

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$\"\"$

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$\"\"$ .

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$\"\"$

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