Given 2 points $(x_1, y_1)$ and $(x_2, y_2)$, the slope of a line that goes through these two points is a ratio of change in y to change in x. That is,
$\dfrac{y_2 - y_1}{x_2 - x_1}$
http://www.learningwave.com/lwonline/algebra_section2/slope3.html
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