$\"\"$

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The system of equations are $\"\"$ .

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Graph :

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Graph the system of equations $\"\"$ is

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$\"\"$

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Observe the graph :

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The solutions are $\"\"$ , $\"\"$ , $\"\"$ and $\"\"$ .

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$\"\"$

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The solutions are $\"\"$ , $\"\"$ , $\"\"$ and $\"\"$ .