A longtime reader of Turtle Talk, Jeff LeMieux, of Oak Harbor, WA, sent in a suggestion based on today’s post on positive and negative slope. Jeff found a way to help students remember not only positive and negative slope, but also the infinite slope of vertical lines, and the 0 slope of horizontal lines … all using the letter “N.”
This is clearly a situation where the picture speaks more loudly than words, so I’ll just let Jeff’s submitted picture do the talking. By the way, to see this image even better, just double click it!
Slope Memory Trick
Thanks for putting this together and sharing it, Jeff!
Some ideas just slap you in the face.
I got slapped this morning as I was flying home from LA to Albuquerque. Those little cocktail napkins they hand out with “beverage service” often give me the urge to write. So this morning, nerdily enough, as I sipped my orange juice at 30,000 feet above the Salton Sea, I worked on figuring out a better way to help students grasp the difference in look between positive and negative slope.
That’s when I got “slapped.”
First, you must realize that I use the three-letter abbreviations of POS and NEG for positive and negative. Do some of you use these as well? I mention this because those abbreviations hold the key. You have to use the first letter of the NEG abbreviation and the last letter of the POS abbreviation.
Let’s start with NEG.
The first letter of NEG is, of course, “N.” But look what I noticed …
Visual Clue for Negative Slope
The trick for POS is a tad more complicated. But I’m hopeful it will work.
Visual Clue for Positive Slope
- So what do you think? Will this work for your students?
If you test it out, please let me know what you find. I’m interested to know. Thanks!