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Math: Coordinate Geometry
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Author:  saby1410 [ 23 Aug 2020, 11:16 ]
Post subject:  Re: Math: Coordinate Geometry

Bunuel VeritasKarishma
If the slope of a line is negative, the line WILL intersect quadrants II and IV. PLEASE EXPLAIN ME THIS PART WITH EAXAMPLE IF POSSIBLE I DIDN'T GET THIS X and Y intercepts of the line with negative slope have the same sign. Therefore if X and Y intersects are positive, the line intersects quadrant I; if negative, quadrant III.

Author:  KarishmaB [ 25 Aug 2020, 23:13 ]
Post subject:  Re: Math: Coordinate Geometry

saby1410 wrote:
Bunuel VeritasKarishma
If the slope of a line is negative, the line WILL intersect quadrants II and IV. PLEASE EXPLAIN ME THIS PART WITH EAXAMPLE IF POSSIBLE I DIDN'T GET THIS X and Y intercepts of the line with negative slope have the same sign. Therefore if X and Y intersects are positive, the line intersects quadrant I; if negative, quadrant III.


Here is a post discussing slopes and intercepts:
https://www.gmatclub.com/forum/veritas-prep-resource-links-no-longer-available-399979.html/2011/0 ... -vertices/

Check it out. Should help resolve your doubts.

Author:  dan0015 [ 05 Jul 2021, 23:51 ]
Post subject:  Re: Math: Coordinate Geometry

2. If the slope of line is positive, line WILL intersect quadrants I and III. Y and X intercepts of the line with positive slope have opposite signs. Therefore if X intersect is negative, line intersects the quadrant II too, if positive quadrant IV.

Is this accurate? If x is negative and y positive, the line should be in Q4 not in Q2.

Author:  Bunuel [ 06 Jul 2021, 00:09 ]
Post subject:  Re: Math: Coordinate Geometry

dan0015 wrote:
2. If the slope of line is positive, line WILL intersect quadrants I and III. Y and X intercepts of the line with positive slope have opposite signs. Therefore if X intersect is negative, line intersects the quadrant II too, if positive quadrant IV.

Is this accurate? If x is negative and y positive, the line should be in Q4 not in Q2.


Check the image below:

Attachments:
Untitled.png
Untitled.png [ 10.35 KiB | Viewed 961 times ]

Author:  dan0015 [ 06 Jul 2021, 01:36 ]
Post subject:  Re: Math: Coordinate Geometry

Thanks Bunuel. Just checked again and my quadrants were numbered differently than in the OP (your Q2 is Q4 in my graph).

Author:  Nina1987 [ 10 Sep 2021, 22:51 ]
Post subject:  Re: Math: Coordinate Geometry

Is the standard form Ax+By+C = 0 or Ax+By= C? I know mathematically they are exact same. But it is better to use one form as otherwise you have to flip the sign for y intercept depending on which for you are using. On the test day you don't want to thinking about this even for a split second, do u? There does not seem to be a general consensus about it among mathematicians but at least if I know which one the OGs use most frequently, I ll go with it. Thanks

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Post subject:  Re: Math: Coordinate Geometry

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