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## #26 2006-10-23 01:38:34

Toast
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Registered: 2006-10-08
Posts: 1,321

### Re: Equation of a Straight Line

Hai, we use y=mx+c in Australia

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## #27 2006-10-23 16:22:23

ganesh
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Registered: 2005-06-28
Posts: 21,812

### Re: Equation of a Straight Line

I remember, I was asked this question at the time of my entry into University in an interview. The Head of the Department, Physics asked me this question. And this is exactly the formula I gave. He was impressed and suggested me to graduate in Mathematics instead of Physics. A pity, I chose Physics instead.

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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## #28 2006-11-17 19:51:53

Toast
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Registered: 2006-10-08
Posts: 1,321

### Re: Equation of a Straight Line

Zhylliolom wrote:

I've never heard of any of the equations in this thread. In my studies I have always used

where ζ is Riemann's zeta function, Γ(x) is the gamma function, ∇ is the del operator, L[sup]-1[/sup] denotes the inverse Laplace transform, T[sub]n[/sub] is the nth Chebyshev polynomial of the first kind, C is a simple closed curve bounding a region having z = a as an interior point, σ[sub]0[/sub][sup]m[/sup] is a simplex of an oriented simplicial complex and [σ[sup]m[/sup], σ[sup]m - 1[/sup]] is an incidence number, S is a compact, orientable, differentiable k-dimensional manifold with boundary in E[sup]n[/sup] and ω is a (k - 1)-form in E[sup]n[/sup], defined, and C[sup]1[/sup] at all points of S, and η(x) is Dirichlet's eta function.

(Sorry for stealing your joke, Ricky. )

...is that actually a straight line equation or is it a whole bunch of mathematical mumbo-jumbo?

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## #29 2006-11-18 01:04:03

mathsyperson
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Registered: 2005-06-22
Posts: 4,900

### Re: Equation of a Straight Line

That is actually a straight line equation or it is a whole bunch of mathematical mumbo-jumbo.

Why did the vector cross the road?
It wanted to be normal.

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## #30 2006-11-18 05:30:29

Toast
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Registered: 2006-10-08
Posts: 1,321

### Re: Equation of a Straight Line

Now I'm even more confused

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## #31 2008-03-01 21:51:40

FFFFFF-
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Registered: 2008-03-01
Posts: 1

### Re: Equation of a Straight Line

In Finland we use the equation y= kx+b, where k = the gradient, and b = the y-intercept, if anyone's interested to know.

Last edited by FFFFFF- (2008-03-01 21:52:09)

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## #32 2008-03-01 22:12:52

MathsIsFun
Administrator
Registered: 2005-01-21
Posts: 7,631

### Re: Equation of a Straight Line

Thanks "FFF...", I will add that.

"The physicists defer only to mathematicians, and the mathematicians defer only to God ..."  - Leon M. Lederman

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## #33 2008-09-14 22:21:26

sitting
Member
Registered: 2008-09-14
Posts: 0

### Re: Equation of a Straight Line

in sweden we type: y = kx + m

k = the gradient
m = the y-intercept

^^

Last edited by sitting (2008-09-14 22:22:11)

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## #34 2008-09-15 00:32:23

MathsIsFun
Administrator
Registered: 2005-01-21
Posts: 7,631

### Re: Equation of a Straight Line

Are you sure, sitting? "m" is normally the gradient ... !

"The physicists defer only to mathematicians, and the mathematicians defer only to God ..."  - Leon M. Lederman

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## #35 2008-10-10 05:18:00

lukeqwerty
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Registered: 2008-10-10
Posts: 0

### Re: Equation of a Straight Line

here in singapore we use y = mx +c too, but most of us use y-y1= m(x-x1)

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## #36 2008-10-10 18:19:06

ganesh
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Registered: 2005-06-28
Posts: 21,812

### Re: Equation of a Straight Line

lukeqwerty,
this equation is used to find the equation of a given straight line when two points on the cartesian plane are given, namely x1 and y1.

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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## #37 2009-03-02 23:22:23

sfd
Member
Registered: 2009-03-02
Posts: 1

### Re: Equation of a Straight Line

Australia uses y=mx+c

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## #38 2009-03-03 01:56:43

ganesh
Moderator
Registered: 2005-06-28
Posts: 21,812

### Re: Equation of a Straight Line

India too uses y = mx + c.
(we have the same origin, don't we? Gondwanaland )

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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## #39 2009-03-03 14:15:09

JaneFairfax
Member
Registered: 2007-02-23
Posts: 6,868

### Re: Equation of a Straight Line

Last edited by JaneFairfax (2009-03-04 05:02:14)

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## #40 2009-04-05 09:20:17

random_fruit
Member
Registered: 2008-12-25
Posts: 39

### Re: Equation of a Straight Line

I'd just like to point out that in post #5, where Ricky divides by product of a and b, his transform does not work if either a or b is zero.  Therefore, his super-complex formula does not work for either y = ax (because b=0) or y = b (cos a=0).

Just me being picky.

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## #41 2009-04-05 09:24:20

random_fruit
Member
Registered: 2008-12-25
Posts: 39

### Re: Equation of a Straight Line

Oops - I spotted Jane's contribution only when my post caused page 2 of the discussion to be displayed; until then I hadn't got as far as page 2.  Can I console myself that I had a similar idea to Jane?

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## #42 2009-10-20 21:24:53

wintersolstice
Real Member
Registered: 2009-06-06
Posts: 123

### Re: Equation of a Straight Line

JaneFairfax wrote:

Actually yes they can!

y=∞x+c LOL

Why did the chicken cross the Mobius Band?
To get to the other ...um...!!!

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