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Author Topic: Hey I am learing about slope in math
Katie
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Icon 2 posted December 20, 2003 14:52      Profile for Katie   Author's Homepage     Send New Private Message       Edit/Delete Post   Reply With Quote 
I just can't get the exact decline rate can anyone help?private message me

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Posts: 183 | From: Florida land of the retired | Registered: Dec 2003  |  IP: Logged
Xanthine

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Icon 1 posted December 20, 2003 16:25      Profile for Xanthine     Send New Private Message       Edit/Delete Post   Reply With Quote 
rise/run. Or y=mx+b where m = slope and b = y-intercept.

If you want an exact, instaneous rate you're gonna have to take a derivative. If that last sentence meant nothing to you, you probably don't need to be worrying (unless you're taking calculus).

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Orpheus
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Icon 1 posted December 20, 2003 19:52      Profile for Orpheus     Send New Private Message       Edit/Delete Post   Reply With Quote 
If you're using graph paper to learn the concept like I did when I was taught it might be more useful to convert the m into a fraction:

y = mx + b
y = (i/j)x + b

then the "rise over run" thing makes more sense

i = rise
j = run

so the quantity i is how many units you move along the y-axis for every j units moved along the x-axis.

dunno if that's what u were asking about but, like many geeks, I like spouting off random bits of knowledge... hope it helped

Edit: oops I just noticed you said pm oh well...

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Tut-an-Geek

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Icon 1 posted December 20, 2003 21:27      Profile for Tut-an-Geek   Author's Homepage     Send New Private Message       Edit/Delete Post   Reply With Quote 
If memory serves, in the form Ax+By = C (standard form) then the slope is -a/b.
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The-Tech
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Icon 1 posted December 21, 2003 05:38      Profile for The-Tech     Send New Private Message       Edit/Delete Post   Reply With Quote 
The slope or m term can be found like this.
Pick two points P1 and P2. P1 is made of X1 and Y1. P2 is made up of Y2 and X2. The slope is
(Y2-Y1)/(X2-X1).

To find the slope given the values of x and y you could do the following
m = (y-b)/x

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illuminatus
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Icon 1 posted December 21, 2003 14:00      Profile for illuminatus   Author's Homepage     Send New Private Message       Edit/Delete Post   Reply With Quote 
m = slope
m = (y2-y1)/(x2-x1)
slope = rise/run

what else is there... (y2-y1)/(x2-x1) is all you should need to remember for a line (take any two points on that line)

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Jace Raven

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Icon 1 posted December 21, 2003 17:28      Profile for Jace Raven         Edit/Delete Post   Reply With Quote 
if the above doesn't work you can always do it the hard way.

Set X to 0 and find the y intercept.
Set Y to 0 and find the x intercept.

plot the two in a sketch and drop the one on top down to the one on the bottom and you should hav your rise over run. given it doesn't work to well if it is a negative slope but if your smart you can make anything work....

i think i may have jsut confused you though. in math i always have to do things the way that i like. most of the time its the hard way.

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dajt
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Icon 1 posted December 22, 2003 13:51      Profile for dajt     Send New Private Message       Edit/Delete Post   Reply With Quote 
I'm afraid I misread the topic as "I am learning about SLEEP in math", and I thought "Yeah, that's math class all right.."
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Katie
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Icon 3 posted December 24, 2003 09:43      Profile for Katie   Author's Homepage     Send New Private Message       Edit/Delete Post   Reply With Quote 
quote:
Originally posted by Jace Raven:
if the above doesn't work you can always do it the hard way.

Set X to 0 and find the y intercept.
Set Y to 0 and find the x intercept.

plot the two in a sketch and drop the one on top down to the one on the bottom and you should hav your rise over run. given it doesn't work to well if it is a negative slope but if your smart you can make anything work....

i think i may have jsut confused you though. in math i always have to do things the way that i like. most of the time its the hard way.

oooooohhhhhhh thanks guys I think i might actually pass this class.Yah! [Smile]

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Jace Raven

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Icon 1 posted December 24, 2003 13:52      Profile for Jace Raven         Edit/Delete Post   Reply With Quote 
you mean it actually helped?
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Katie
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Icon 1 posted December 24, 2003 14:21      Profile for Katie   Author's Homepage     Send New Private Message       Edit/Delete Post   Reply With Quote 
quote:
Originally posted by Jace Raven:
you mean it actually helped?

pretty much;yeah
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linuxpyro
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Icon 1 posted January 14, 2004 17:08      Profile for linuxpyro   Author's Homepage     Send New Private Message       Edit/Delete Post   Reply With Quote 
Ah, yes, the simple slope formula. That's not hard. Wait till you get to Calculus...
Posts: 29 | From: /home/ben | Registered: Jan 2004  |  IP: Logged


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