Categories Linear, Quadratic, and Exponential Models* slope Slope Stuff Post author By mpershan Post date December 20, 2012 3 Comments on Slope Stuff What’s up? How do you help kids avoid this mistake? Thanks again to Andy Zsiga for the submission. Share this:EmailPrint ← Circumference and Right Triangles → Solving for a variable 3 replies on “Slope Stuff” You mean the mistake of inverting the slopes? Visualize! Draw a little graph! Then you’ll remember that the change in the Y-coordinate is the “rise”! For the mistakes in combining positive and negative numbers, relate it to money. -3 means your checking account is overdrawn 3 dollars. Minus 18 means you just did a debit card swipe for another 18 dollars. What’s your balance now? The analogy doesn’t work as well for subtracting a negative number, but it’s a start. On the subtracting a negative number, you could relate it to forgiving a debt. If you overdrew by 21 dollars and then the banker had compassion and decided to forgive $10 of the debt, how much would you owe? Oh, that’s good! They’re going to “take away” that -$10 liability. Comments are closed.