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Slope of the line

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The slope of a non-vertical line through any two points is given by

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            \"\"

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\"\"

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Substitute \"\" in slope formula.

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\"\"

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\"\"                                            (Signs are same. So, product is positive)

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\"\"                                                (Add: \"\")

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\"\"                                                   (Subtract:\"\" )

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\"\" 

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The slope of the line that passes through the points is \"\" .