Find all School-related info fast with the new School-Specific MBA Forum

It is currently 24 Jul 2014, 04:16

Close

GMAT Club Daily Prep

Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track
Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

What is the equation of the line that passes thru (1,1) and

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Director
Director
avatar
Joined: 17 Oct 2005
Posts: 941
Followers: 1

Kudos [?]: 16 [0], given: 0

GMAT Tests User
What is the equation of the line that passes thru (1,1) and [#permalink] New post 20 Feb 2006, 17:31
What is the equation of the line that passes thru (1,1) and (-4,-2).

find the y-intercept also.
Manager
Manager
User avatar
Joined: 14 Dec 2005
Posts: 77
Followers: 1

Kudos [?]: 0 [0], given: 0

 [#permalink] New post 20 Feb 2006, 17:35
What is the equation of the line that passes thru (1,1) and (-4,-2).

find the y-intercept also.

m= -2-1 / (-4-1) = -3/-5 = 3/5

equation of line = y = 3/5 x + b => b = 2/5

equation o fline y = 3/5 x + 2/5
Director
Director
avatar
Joined: 17 Oct 2005
Posts: 941
Followers: 1

Kudos [?]: 16 [0], given: 0

GMAT Tests User
 [#permalink] New post 20 Feb 2006, 17:38
how did you get the y-intercept? Its been so long :oops:
Intern
Intern
avatar
Joined: 18 Feb 2006
Posts: 23
Followers: 0

Kudos [?]: 0 [0], given: 0

 [#permalink] New post 20 Feb 2006, 17:44
y-intercept -> where the line intersects the y-axis.

Start with the equation of the line, but let y = 0.

y = 3/5 x + 2/5
0 = 3/5 x + 2/5
0 = 3x + 2
-2 = 3x
x = -2/3

(x, y) = (-2/3, 0)
Manager
Manager
User avatar
Joined: 14 Dec 2005
Posts: 77
Followers: 1

Kudos [?]: 0 [0], given: 0

 [#permalink] New post 20 Feb 2006, 17:45
y-intercept is the value of b.


I think what zoelef has is the x-intercept.
Manager
Manager
avatar
Joined: 13 Dec 2005
Posts: 225
Location: Milwaukee,WI
Followers: 1

Kudos [?]: 6 [0], given: 0

GMAT Tests User
 [#permalink] New post 20 Feb 2006, 17:50
Avis u r right for y intercept put x = 0 in the equation u got ... so in the equation given by y = 3/5 x + 2/5 putting x =0 u get y = 2/5

so at the point (0,2/5 ) the line will cut the y axis .
Intern
Intern
avatar
Joined: 18 Feb 2006
Posts: 23
Followers: 0

Kudos [?]: 0 [0], given: 0

 [#permalink] New post 20 Feb 2006, 17:57
Avis wrote:
y-intercept is the value of b.


I think what zoelef has is the x-intercept.


As a mathematics major, me fungling something that basic is solid proof that college makes you stupider.
Senior Manager
Senior Manager
User avatar
Joined: 11 Jan 2006
Posts: 273
Location: Chennai,India
Followers: 1

Kudos [?]: 3 [0], given: 0

GMAT Tests User
 [#permalink] New post 21 Feb 2006, 07:08
Avis wrote:
y-intercept is the value of b.


I think what zoelef has is the x-intercept.


but how u got b ==> 2/5 ?? i dont understand...
_________________

vazlkaiye porkalam vazltuthan parkanum.... porkalam maralam porkalthan maruma

Intern
Intern
avatar
Joined: 13 Nov 2005
Posts: 9
Followers: 0

Kudos [?]: 0 [0], given: 0

 [#permalink] New post 21 Feb 2006, 07:21
I could not understand how you got the value of b.
Can you please elaborate.

Way2go
Director
Director
User avatar
Joined: 05 Feb 2006
Posts: 904
Followers: 1

Kudos [?]: 24 [0], given: 0

GMAT Tests User
 [#permalink] New post 21 Feb 2006, 07:32
razrulz wrote:
Avis wrote:
y-intercept is the value of b.


I think what zoelef has is the x-intercept.


but how u got b ==> 2/5 ?? i dont understand...


You must know the formula in such cases...

We have (1;1) (-4;-2) on the coordinate plane...

the basic equation here is y=mx+b (where m is the slope of the line, x is the x intercept of the line and b is y intercept of the line)

Now first of all we need a slope of the line:
The slope of the line is m=change in y/change in x or (y1-y2)/(x1-x2)
Plug in the numbers... m=(-2-1)/(-4-1)=3/5

Now to find the equation use the same formula which we used in order to find the slope....

m=(y1-y)/(x1-x)....... m(x1-x)=y1-y once again plug in the values for x1 and y1 and m....

3/5(-4-x)=-2-y
-12/5-3/5x=-2-y
-y=2-12/5-3/5x..... 2-12/5 equals -2/5
-y=-2/5-3/5x
y=3/5x+2/5
now we remember the formula y=mx+b where b denotes y intercept, this means y intercept is 2/5.....

If we were also asked to calculate the x intercept we would give y the value of 0 and solve the equation....
3/5x+2/5=0
3/5x=-2/5
x=-2/3, this line croses x axis at -2/3.....
Director
Director
avatar
Joined: 17 Oct 2005
Posts: 941
Followers: 1

Kudos [?]: 16 [0], given: 0

GMAT Tests User
 [#permalink] New post 21 Feb 2006, 16:07
thanks guys, much appreciated :-D
  [#permalink] 21 Feb 2006, 16:07
    Similar topics Author Replies Last post
Similar
Topics:
OG 11-199 > Reflection of a point thru line Economist 5 16 Jul 2009, 19:58
What is the equation of a straight line passing through the Caas 2 02 Jun 2007, 05:00
IN the xy-plane, the line k passes thru the origin and thru gmacvik 3 15 Sep 2006, 16:17
What is the equation of the line w that passes though the kevincan 4 13 Aug 2006, 14:02
A circle passes thru the coordinates (4,0) (-4,0). What is karovd 11 23 Nov 2004, 12:19
Display posts from previous: Sort by

What is the equation of the line that passes thru (1,1) and

  Question banks Downloads My Bookmarks Reviews Important topics  


cron

GMAT Club MBA Forum Home| About| Privacy Policy| Terms and Conditions| GMAT Club Rules| Contact| Sitemap

Powered by phpBB © phpBB Group and phpBB SEO

Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.