Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ π -¹ ² ³ °

You are not logged in.

- Topics: Active | Unanswered

**Toast****Real Member**- Registered: 2006-10-08
- Posts: 1,321

Hai, we use y=mx+c in Australia

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 20,125

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.

Offline

**Toast****Real Member**- Registered: 2006-10-08
- Posts: 1,321

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?

Offline

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

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.

Offline

**Toast****Real Member**- Registered: 2006-10-08
- Posts: 1,321

Now I'm even more confused

Offline

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

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)*

Offline

**MathsIsFun****Administrator**- Registered: 2005-01-21
- Posts: 7,604

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

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

Offline

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

in sweden we type: y = kx + m

k = the gradient

m = the y-intercept

^^

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

Offline

**MathsIsFun****Administrator**- Registered: 2005-01-21
- Posts: 7,604

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

Offline

**lukeqwerty****Member**- Registered: 2008-10-10
- Posts: 0

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

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 20,125

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.

Offline

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

Australia uses y=mx+c

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 20,125

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.

Offline

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

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

Offline

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

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.

Offline

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

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?

Offline

**wintersolstice****Real Member**- Registered: 2009-06-06
- Posts: 122

JaneFairfax wrote:

Actually yes they can!

y=∞x+c LOL

Why did the chicken cross the Mobius Band?

To get to the other ...um...!!!

Offline