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39 geometry ds

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by m&m » Sat Oct 03, 2009 10:00 am
any line will intersect the x-axis at the point where its y-coordinate is = 0

so setting the equation below to 0 will give us the point where the line intersects the x-axis...

ax+c=0
x=-c/a

so the axis and the line will intersect at (-c/a, 0)

now we need to know the value of c/a...

neither of the answer choices help us evaluate the above so I ans should be E
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by ern5231 » Thu Oct 08, 2009 7:42 pm
OA is D!
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Re: 39 geometry ds

by Brent@GMATPrepNow » Fri Oct 09, 2009 10:51 am
ern5231 wrote:39) At what point do the lines ax+by+c and x axis intersect?
(1) a ≠ 0
(2) ab>0
How does ax+by+c represent a line?
Do you mean ax+by+c=0?
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Re: 39 geometry ds

by Stuart@KaplanGMAT » Fri Oct 09, 2009 6:16 pm
Brent Hanneson wrote:
ern5231 wrote:39) At what point do the lines ax+by+c and x axis intersect?
(1) a ≠ 0
(2) ab>0
How does ax+by+c represent a line?
Do you mean ax+by+c=0?
That was my question: ax+by+c doesn't represent a line on the xy plane, it's just an expression. Geometric shapes need to be in equation form in the coordinate plane.
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by ern5231 » Sun Oct 11, 2009 2:17 pm
Pardon me! It is ax+by+c=0.
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by gmat620 » Mon Oct 19, 2009 5:17 pm
ern5231 wrote:Pardon me! It is ax+by+c=0.
IN that case IMO answer is E..wats OA ?
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