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GMAT prep coordinate geometry

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Source: — Data Sufficiency |
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by gaggleofgirls » Mon Jan 26, 2009 10:35 pm
1) gives us the equation: y = 3(C)x + C where C is the constant representing the y intercept. That alone is not enough to actually give the Y intercept, so not sufficient.

2) The x-intercept of line L = -1/3. Only tells us the X intercept, on its own, not sufficient.

So that leaves us C - together sufif or E - togethre not sufficient.

When you put them together you get:
0 = 3(C)(-1/3) + C
0 = -C + C
0 = 0
Still doesn't tell us the slope or the Y intercept, so insufficient.

Answer = E.

-Carrie
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by awilhelm » Tue Jan 27, 2009 8:08 am
Right, thanks!
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Re: GMAT prep coordinate geometry

by malhotneha » Tue Jan 27, 2009 4:15 pm
[quote="awilhelm"]In the xy-plane, what is the y-intercept of line L?

1) The slope of line L is 3 times its y-intercept
2) The x-intercept of line L is -1/3[/quote]

Whats the QA?
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