The slope of an equation is the m part in the y = mx + b format. This mean you do the change in y over the change in x creating the slope.
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This Is a Certified Answer

There's no such thing as the slope of an equation.  Equations don't have slopes. 

But if you draw the graph of the equation, and the graph is a straight line, then the
slope is the slope of that line. 

If the equation doesn't produce a straight-line graph, then it has curves, and there are
many slopes. The slope at every point on the graph is the slope of a straight line that
would just touch the graph at that point.  As the graph curves, the slope changes.