Solve this algebra problem for me, pleeeeease

Nate the Grate · 12-03-2002, 09:49 PM

Taken from a test of mine that I have to correct and hand in again.

5) Find the equation of a line through these points. (3,-4) and (-1,8) Show steps please.

Okay, I know that you have to use y=mx+b, but I don't know how. can someone explain this to me, pleeeeeeeeeease?

ZERO · 12-03-2002, 09:55 PM

slope=m= (x1-x2)/(y2-y1)

then you take the eqn y=mx +b, substitute the slope, and a set of points, that gives you the y-intercept. then you'd get:

y=(slope you found)x + (y-intercept you found)

Nate the Grate · 12-03-2002, 10:01 PM

Quote:

Originally posted by ZERO
slope=m= (x1-x2)/(y2-y1)

then you take the eqn y=mx +b, substitute the slope, and a set of points, that gives you the y-intercept. then you'd get:

y=(slope you found)x + (y-intercept you found)

ahhhhh the y-intercept! that's what I've been missing this whole time!

thanks!

Samsa · 12-03-2002, 10:01 PM

oh my god this is called cheating, stupid dude

Pleasure|Contempt · 10:11 PM

Quote:

Originally posted by Samsa
oh my god this is called cheating, stupid dude

Yeah but it probably won't change the grade he got, just show the teacher that he's learned how to do it....though getting the answer this way sort of defeats the purpose :\

So the only person he's cheating is himself, not learning the material properly.

Liquid-J · 12-03-2002, 10:12 PM

Quote:

Originally posted by ZERO
slope=m= (x1-x2)/(y2-y1)

then you take the eqn y=mx +b, substitute the slope, and a set of points, that gives you the y-intercept. then you'd get:

y=(slope you found)x + (y-intercept you found)

no dude, the slope of a line is the change in y over the change in x.

(y1-y2)/(x1-x2)

right?

ZERO · 12-03-2002, 10:13 PM

Quote:

Originally posted by Liquid-J

no dude, the slope of a line is the change in y over the change in x.

(y1-y2)/(x1-x2)

right?

yep. sorry

Pleasure|Contempt · 12-03-2002, 10:13 PM

Yep, rise over run.

Nate the Grate · 12-03-2002, 10:13 PM

actually, I wasn't given the answer, just how to find it. I already got my test grade (a 77

), I'm just trying to earn a few bonus points by correcting my mistakes.

plus, our teacher said we could use outside sources to find the answer, including the internet. maybe he isn't up to date with the wonder of the "message board" or "chat room".

Liquid-J · 12-03-2002, 10:14 PM

its all good.

Nate the Grate · 12-03-2002, 10:15 PM

I already knew the slope part anyways. It was the only part of the problem that I got right.

Mooney · 12-03-2002, 10:16 PM

i would find the slope, then use the point-slope forumla. y-y1 = m(x-x1). i think. but i'm failing calculus right now so don't listen to me.

Pleasure|Contempt · 12-03-2002, 10:25 PM

Quote:

Originally posted by Nate the Grate
I'm just trying to earn a few bonus points by correcting my mistakes.

*eats his words*
I wish I got that deal whenI was in HS :\

peabody · 12-03-2002, 10:29 PM

are you a senior?

holy fuck, if you are.

Nate the Grate · 12-03-2002, 10:34 PM

Quote:

Originally posted by peabody
are you a senior?

holy fuck, if you are.

no, sophomore.

peabody · 12-03-2002, 10:36 PM

is tear stained glass a senior?

i always get you guys confused.

Nate the Grate · 12-03-2002, 10:43 PM

Quote:

Originally posted by peabody
is tear stained glass a senior?

i always get you guys confused.

I think we're the same age

tear stained glass · 12-03-2002, 10:46 PM

Quote:

Originally posted by peabody
is tear stained glass a senior?

i always get you guys confused.

I am also a sophomore, but age-wise, Nate's slightly older than me. And I'm in Algebra 2 Honors.

But I'm only #7 in the class. :\

peabody · 12-03-2002, 10:56 PM

what! you were a senior the other day.

Eulogy · 12-03-2002, 11:16 PM

Ah, the youth of Netphoria...

I'm probably the only freshman here...

Anyway...how I miss Algebra. Geometry is so boring. I can't handle it. It's my last class every day...and it just makes me want to kill myself. All these shapes....and drawing on motherfucking tracing paper. Good god. Geometry is the devil. At least it's easy as hell, though.

lawson · 12-03-2002, 11:27 PM

Quote:

Originally posted by peabody
are you a senior?

holy fuck, if you are.

seriously- netphoria has sunk to middle school math problems. BRING OUT THE BIG GUNS PAHLEEZ

O'Doyle Rules · 12-04-2002, 12:18 AM

slope formula: m = (y1-y2) / (x1-x2)
m = 12 / 4 = 3

point slope formula: y - y1 = m(x - x1)
y + 4 = 3(x - 3)
y = 3(x - 3) - 4
y = 3x - 9 - 4
y = 3x - 13

DeadSwan · 12-04-2002, 01:03 PM

man. this is like. the scariest post in the history of netphoria.

i stopped even thinking about math my junior year of high school.

rubber · 12-04-2002, 01:37 PM

The correct slope is -3 and the correct equation is y = -3x + 5.

c

DeviousJ · 12-04-2002, 01:57 PM

Quote:

Originally posted by rubber
The correct slope is -3 and the correct equation is y = -3x + 5.

c

Finally

Samsa · 12-04-2002, 02:07 PM

Quote:

Originally posted by DeadSwan
man. this is like. the scariest post in the history of netphoria.

i stopped even thinking about math my junior year of high school.

NO THIS ONE IS

:ROFL:

12-03-2002, 09:49 PM	#1
Nate the Grate Minion of Satan Posts: 6,212	Solve this algebra problem for me, pleeeeease Taken from a test of mine that I have to correct and hand in again. 5) Find the equation of a line through these points. (3,-4) and (-1,8) Show steps please. Okay, I know that you have to use y=mx+b, but I don't know how. can someone explain this to me, pleeeeeeeeeease?

12-03-2002, 10:16 PM	#12
Mooney Socialphobic Location: halifax Posts: 14,821	i would find the slope, then use the point-slope forumla. y-y1 = m(x-x1). i think. but i'm failing calculus right now so don't listen to me. __________________

12-03-2002, 09:55 PM	#2
ZERO Apocalyptic Poster Posts: 1,494	slope=m= (x1-x2)/(y2-y1) then you take the eqn y=mx +b, substitute the slope, and a set of points, that gives you the y-intercept. then you'd get: y=(slope you found)x + (y-intercept you found)

12-03-2002, 10:01 PM	#4
Samsa Banned Location: A theater near you Posts: 7,929	oh my god this is called cheating, stupid dude

12-03-2002, 10:13 PM	#8
Pleasure\|Contempt viva la revolution eh, comrades? Location: Halifax Posts: 2,107	Yep, rise over run.

12-03-2002, 10:14 PM	#10
Liquid-J keeping it to a dull roar Location: san francisco, ca Posts: 12,824	its all good.

12-03-2002, 10:15 PM	#11
Nate the Grate Minion of Satan Posts: 6,212	I already knew the slope part anyways. It was the only part of the problem that I got right.

12-03-2002, 10:29 PM	#14
peabody Minion of Satan Location: Pittsburgh Posts: 5,459	are you a senior? holy fuck, if you are.

12-03-2002, 10:36 PM	#16
peabody Minion of Satan Location: Pittsburgh Posts: 5,459	is tear stained glass a senior? i always get you guys confused.

12-03-2002, 10:56 PM	#19
peabody Minion of Satan Location: Pittsburgh Posts: 5,459	what! you were a senior the other day.

12-03-2002, 11:16 PM	#20
Eulogy huh Posts: 62,361	Ah, the youth of Netphoria... I'm probably the only freshman here... Anyway...how I miss Algebra. Geometry is so boring. I can't handle it. It's my last class every day...and it just makes me want to kill myself. All these shapes....and drawing on motherfucking tracing paper. Good god. Geometry is the devil. At least it's easy as hell, though.

12-04-2002, 12:18 AM	#22
O'Doyle Rules Demi-God Location: nyc Posts: 374	slope formula: m = (y1-y2) / (x1-x2) m = 12 / 4 = 3 point slope formula: y - y1 = m(x - x1) y + 4 = 3(x - 3) y = 3(x - 3) - 4 y = 3x - 9 - 4 y = 3x - 13

12-04-2002, 01:03 PM	#23
DeadSwan Socialphobic Location: GAZA STRIP MALL Posts: 10,828	man. this is like. the scariest post in the history of netphoria. i stopped even thinking about math my junior year of high school.

12-04-2002, 01:37 PM	#24
rubber Ownz Location: Canada Posts: 799	The correct slope is -3 and the correct equation is y = -3x + 5. c