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Nick_K

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I thought the gradient of y was undefined, not infinity.

y*x = -1

y*0 = -1

y = -1/0

Therefore y is undefined.

Might be completely wrong here though.
 

shaon0

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x-y axis are perpendicular because its easier to find distances between points. And, 0.9 (recurring)=1
 

hscishard

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I thought the gradient of y was undefined, not infinity.

y*x = -1

y*0 = -1

y = -1/0

Therefore y is undefined.

Might be completely wrong here though.
You are right. The gradient of the y axis in undefined.

But you can also says its infinity, in a way.
 

kaz1

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Anything multiplied by infinity is infinity and anything multiplied by 0 is 0. So it's pretty much a paradox imo.
 

twistedrebel

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mate you should do chaos maths, (Phd level) then spend 3-5 years trying to prove that.
 

brunx

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is this a legit proof?...

0.999.... let equal x
10x = 9.999...
10x - x = 9x = 9.999... - 0.999... = 9
ie. 9x=9
x=1
0.999... = 1
 

hscishard

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Dunno. But the concept is correct for other recurring decimals. In a way for 0.9 repeata = 1 it kinda contradicts itself.
 

untouchablecuz

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OMG. I know where you guys are comming from. I know the facts.
But I found it interesting. Jeez.

Fine heres a question. Prove that the x axis is perpendicular to the y axis.


(No, i'm not saying infinity x 0 is -1!!!)
they are defined to be perpendicular. the x axis and the y axis arent magical lines that are by nature perpendicular
 

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