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Topic: "no slope"
Replies: 35   Last Post: Jan 23, 2010 6:01 PM

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 MMerwin5@aol.com Posts: 11 Registered: 12/3/04
Re: "no slope"
Posted: Dec 14, 2009 11:37 AM
 att1.html (2.3 K)

I use "no slope" and "zero slope" for horizontal lines. Vertical lines have "undefined slope" and I describe that to my students as "a line that is so steep, its slope cannot be defined".

-----Original Message-----
From: TKENYON@crcs.wnyric.org
To: nyshsmath@mathforum.org
Sent: Mon, Dec 14, 2009 11:20 am
Subject: "no slope"

This has been bothering me. The textbook we're using (Amsco) states that a horizontal line has "no slope." Is this terminology considered correct? I've found it very misleading for students as slope has a relationship to the real world. If a driveway, street, floor, or carpenter's level showed "no slope", I would expect them to be horizontal, not vertical. There is a number associated with "no": zero. I have no giraffes running around in my classroom. I've told my students in the past that "it's okay to say that there's 'no value for the slope', or to say that the 'slope is undefined.'"

It's only in recent years that I've ever seen "no slope" to describe a vertical line. Anyone care to chime in?

-Tom Kenyon
CRCS Mathematics/Physics
tkenyon@crcs.wnyric.org

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Date Subject Author
12/14/09 Tom Kenyon
12/14/09 precopio@nycap.rr.com
12/14/09 Roberta Silver
12/14/09 steven arnofsky
12/14/09 Roberta M. Eisenberg
12/15/09 Tony George
12/15/09 MathCaryl@aol.com
12/16/09 Don
12/16/09 Roberta Silver
12/16/09 Robert Hazen
12/18/09 slashlee@chkingston.org
12/16/09 Mathematics226@aol.com
12/17/09 precopio@nycap.rr.com
12/19/09 StGOLD2112@aol.com
12/14/09 MMerwin5@aol.com
12/14/09 Roberta M. Eisenberg
12/14/09 VanLeeuwen, David
12/14/09 BHowitt@wlsv.org
12/14/09 precopio@nycap.rr.com
12/14/09 VanLeeuwen, David
12/14/09 Roberta M. Eisenberg
12/14/09 AAP
12/14/09 Roberta M. Eisenberg
12/15/09 Tom Kenyon
12/15/09 Tom Kenyon
12/14/09 Roberta M. Eisenberg
12/14/09 John Sittig
12/15/09 Tom Kenyon
12/15/09 ElizWaite@aol.com
12/15/09 ezseller@mail.nasboces.org
12/26/09 Nick B
12/27/09 Roberta M. Eisenberg
1/23/10 Nick B
1/22/10 Happy McClurg
1/23/10 Robert Orchanian
1/23/10 Charlie Marion