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# In the xy-plane, at what two points does the graph of y =

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Intern
Joined: 12 Jul 2006
Posts: 8
In the xy-plane, at what two points does the graph of y = [#permalink]

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13 Oct 2008, 19:08
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In the xy-plane, at what two points does the graph of y = (x+a) (x+b) intersect the x-axis?

1) a + b = -1
2) The graph intersects the y-axis at (0, -6)
Intern
Joined: 12 Jul 2006
Posts: 8
Re: DS on XY plane [#permalink]

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13 Oct 2008, 19:19
vishalgc wrote:
IMO C:

OA?

OA is C. Can you plz explain. I am not good with Co-geometry
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Joined: 17 Jun 2008
Posts: 1529
Re: DS on XY plane [#permalink]

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13 Oct 2008, 21:11
udribat wrote:
vishalgc wrote:
IMO C:

OA?

OA is C. Can you plz explain. I am not good with Co-geometry

y = (x+a)(x+b) will intersect x axis at (-a,0) and (-b,0). Thus, we need to find the values of a and b.

Stmt1 by itself is not sufficient. Stmt2 by itself is not sufficient, as this means ab = -6.

Combining stmt1 and stmt2 will give values of a and b.
Re: DS on XY plane   [#permalink] 13 Oct 2008, 21:11
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