What does the slope of a line tell us?
Slope's Secret Story
What does the slope of a line tell us?

Picture a hill. Some hills are gentle strolls; others make your calves scream. A line on a graph has its own kind of steepness, and we have a word for it: slope. Slope is just a number that answers one cheeky question — how fast is this line climbing?
Here's the secret recipe. To find slope, you compare two things as you walk along the line: how much you go UP, and how much you go ACROSS. Slope is the up-amount divided by the across-amount. People say it as a tidy little rhyme: "rise over run."
