The depth of a lake, dd, varies directly with rr, the amount of rainfall last month. if kk is the constant of variation, which e
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The slope (or average rate of change) formula is: 
. It is easy to remember as "slope is easy and fun, rise over run" where the y-values of the 2 points would be the "rise" and the x-values of the 2 points would be the "run" So with two points, you label one point as 
and the other as 
. Then you insert these points into the slope formula (m represents slope). So, 
where (-3,6) is x2 and y2 and (5,1) is x1 and y1. It would simplify to 
.