$\"\"$

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Given that $\"\"$ .

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Find the slopes of $\"\"$ .

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The slope of $\"\"$ is

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Let $\"\"$ be $\"\"$ and $\"\"$ be $\"\"$ .

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$\"\"$ (Slope formula)

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$\"\"$ (Substitute $\"\"$ )

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$\"\"$ (Simplify) $\"\"$

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The slope of $\"\"$ is

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Let $\"\"$ be $\"\"$ and $\"\"$ be $\"\"$ .

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$\"\"$ (Slope formula)

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$\"\"$ (Substitute $\"\"$ )

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$\"\"$ (Simplify) $\"\"$

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The lines $\"\"$ have the same slope. So, the lines $\"\"$ are parallel. \ \