\"Slope

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\"\"

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 Observe that y-coordinates of two points are same. Therefore the line is,

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 Horizontal, then the slope is zero.

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Verify the solution:

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Slope formulae \"\".

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\"\"            (Substitute  \"\")

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\"\"              (Subtract: \"\")

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\"\"                     (Additive inverse property: \"\")

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\"\"                       (Divide: \"\")\"\" 

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Slope  \"\".