Math!!

[Altron]

Ummm...

This is what I did

y=(-4/7)x+b

5=(-4/7)9+b

35=(-4)9+b

35=-36+b

71=b

So y=(-4/7)x+71

now for the Y intercept
0=(-4/7)x+71
0=-4x+71
71=4x
17.75=x

And X intercept

y=(-4/7)0+71
y=71

 

[Altron]

Whoops! Forgot standard form (ax+by=c)

y=(-4/7)x+71
7y=-4x+71
-4x+7y=71
4x+7y=21

 

[Stop Laughing]

I miss my TI-89. I must find it...

I also wanted to write a proof for why e^( (pi)*i ) = -1. I know I did it once...

 

[Luis G]

Ummm...

This is what I did

y=(-4/7)x+b

5=(-4/7)9+b

35=(-4)9+b

35=-36+b

71=b

So y=(-4/7)x+71

now for the Y intercept
0=(-4/7)x+71
0=-4x+71
71=4x
17.75=x

And X intercept

y=(-4/7)0+71
y=71

Geez, i gotta stop thinking about analytic geometry, i did everything with tangents. The faster way is to do it just like you did. However you have a small mistake.

y = mx+b
5 = (-4/7)(9) + b
b = 35/7 + 36/7
b= 71/7

then.
y = -4/7 x + 71/7

 

[Altron]

Yeah, I missed that.
We usually do whole number slopes in Math

 

[Jeslek]

Show that the surfaces 2 = x^2 + y^2 - 1 and 2z = 1 - x^2 - y^2 are orthogonal at all points of intersection.

 

[Luis G]

time to remember what orthogonal means

 

[Squiggy]

This stuff really does make you want to pee in the shower...

/me heads toward the shower...

 

[Jeslek]

time to remember what orthogonal means

Orthogonal means that the standard inner product is 0 Or for not-too-math-oriented, the dot product is 0. Or for the geometric oriented, perpendicular. However perpendicular is kind of silly since how do you draw a perpendicular line in 4D or higher?

 

[Aunty Em]

Uh oh! Not another math calc thread. Think I'll keep my head down...

 

[alex]

Uh oh! Not another math calc thread. Think I'll keep my head down...

 

[Altron]

I got my test back, 89
Well we are learning midpoint, the easiest thing ever
(6,3) and (0,-1/2)
Took me a whole 10 seconds to figure out (-4,-4)
And my friends are now calling me "super genius" because they looked at it for 5 minutes ang got (-4,-2)
We have a test on perpendicular and parallel tomarrow
So the perpendicular slope to -4/7 will be 7/4
Then the parallel is still in my favorite y=mx+b

 

[TLS]

I like apples

 

[drkavnger99]

Geez I hate math and you just reminded me why... man I have a headache!

 

[Altron]

I like apples

Wonderful!
Do you want a cookie?

 

[Mirlyn]

I like apples

Wonderful!
Do you want a cookie?

YES.


*hates when people offer and don't follow through*

 

[Professur]

Why in the hell would you need to know Algebra if you want to be a writer?

To make sure the publisher isn't screwing you. You get paid X for the manuscript, and y per book sold, plus z for public appearances and book signings.

Your paycheck has to equal x+(y*number of books)+z

Duh.

 

[Aunty Em]

To make sure the publisher isn't screwing you. You get paid X for the manuscript, and y per book sold, plus z for public appearances and book signings.

Your paycheck has to equal x+(y*number of books)+z

Duh.

Looks like basic arithmatic to me....