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November 08, 2025, 05:19:36 am
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Author Topic: Find the equation...?  (Read 869 times)  Share 

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Cappuccinos

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Find the equation...?
« on: January 20, 2011, 04:14:10 pm »
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So I'm supposed to find the equation for this graph
*The orange bit in the attached picture*
Its a modulus/absolute value function

I have no idea what to do..
All I've got so far is (which was obtained by entering random stuff into the calc until I got a similar looking graph :buck2:)

What steps are you supposed to do when solving type of question?
What was the original function? I also need to state the domain? right?
Sorry about my noobness  :-\

Edit: Oh and the x-intercepts are at 36 & 40! NOT 35 & 40!
« Last Edit: January 20, 2011, 04:26:29 pm by Steph243 »
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Romperait

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Re: Find the equation...?
« Reply #1 on: January 20, 2011, 04:27:36 pm »
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Since you know two points, , then you can find gradient...






Since the modulus occurs at , you can write the modulus function as .

Sorry if it's wrong / hard to understand. First time doing maths on a computer. :P

Edit: fix'd

Also

Edit 2: Run over rise tends to not work in these situations. =(
« Last Edit: January 20, 2011, 05:01:41 pm by Romperait »
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onur369

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Re: Find the equation...?
« Reply #2 on: January 20, 2011, 04:32:29 pm »
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You used the two-mean method if I am not wrong...

y-y1= m(x-x1)
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Mao

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Re: Find the equation...?
« Reply #3 on: January 20, 2011, 04:57:12 pm »
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is the equation you seek.
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Cappuccinos

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Re: Find the equation...?
« Reply #4 on: January 20, 2011, 05:03:24 pm »
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Sorry, I think I left the edit a bit late. Btw, I didn't mean to yell D:

Quote from: onur369 on January 20, 2011, 04:32:29 pm
You used the two-mean method if I am not wrong...

y-y1= m(x-x1)


Whats a two - mean method? Ah I shouldn't be doing methods should I? :/

Quote from: Romperait on January 20, 2011, 04:27:36 pm
Since you know two points, , then you can find gradient...






Since the modulus occurs at , you can write the modulus function as .

Sorry if it's wrong / hard to understand. First time doing maths on a computer. :P

Edit: fix'd

Also

Hahah thanks!  I get your jist.  The answer wasn't correct though it's   your theory was though :) Your error was  it should be
« Last Edit: January 20, 2011, 05:05:59 pm by Steph243 »
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Romperait

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Re: Find the equation...?
« Reply #5 on: January 20, 2011, 05:08:44 pm »
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Quote from: Steph243 on January 20, 2011, 05:03:24 pm
Hahah thanks!  I get your jist.  The answer wasn't correct though it's   your theory was though :) Your error was   it should be

 :-\

Ah well.

Thanks Mao, btw.
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Cappuccinos

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Re: Find the equation...?
« Reply #6 on: January 20, 2011, 05:09:27 pm »
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Haha actually Romperait you are right. I missed your newest edit :/
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taiga

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Re: Find the equation...?
« Reply #7 on: January 20, 2011, 09:15:25 pm »
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I didn't read  much, but how does 38-35 = 2 

:X
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Pixon

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Re: Find the equation...?
« Reply #8 on: January 20, 2011, 09:21:11 pm »
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OP originally said 35 instead of 36.
BTW..Romperait you noob. jks? :P
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Romperait

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Re: Find the equation...?
« Reply #9 on: January 20, 2011, 09:25:51 pm »
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Quote from: Pixon on January 20, 2011, 09:21:11 pm
OP originally said 35 instead of 36.
BTW..Romperait you noob. jks? :P

^-^
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