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The equation represents a constant rate of change and *k* is the

constant of variation.

Compare the equation with equation .

The constant of variation is .

The slope *m* of a non vertical line through any two points is given by,

(Substitute )

(Product of two same signs is positive)

(Additive indentity property: )

(Additive indentity property: )

Slope .

The slope *m* of the line that passes through the pair of points is .

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