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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