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

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Intern
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Joined: 03 Feb 2009
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In the xy-plane, at what two points does the graph of y = [#permalink]

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New post 02 Mar 2009, 10:21
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A
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C
D
E

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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)

Kudos [?]: 22 [0], given: 0

Intern
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Joined: 03 Feb 2009
Posts: 27

Kudos [?]: 22 [0], given: 0

Schools: Duke, UNC, Emory, Ga Tech, Vanderbilt, Indiana, Wash U, Texas, Rollins
Re: DS: Equation of Line [#permalink]

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New post 02 Mar 2009, 10:27
Please check my thought process to see if this is correct, as I took an educated guess on this problem.

The question is asking what will x be when y equals zero. So we need to find exact values for a and b

1) a + b = -1

a and b could be any number of different values to make this equation work
NOT suff

2) (0, -6) is a point on the graph
-6 = (0 + a)(0 + b)
-6 = a*b

a and b could be any number of different values to make this equation work.
NOT suff

Together) 2 equations, 2 unknowns to you can find a and b to find the two x coordinates where y = 0.
C is the answer.

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Director
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Re: DS: Equation of Line [#permalink]

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New post 02 Mar 2009, 11:56
is it E?
as there could be two posibilities
when y=0, x is either -a or -b
now solving 2 equation we get
2,-3
or -3,2

we get
bmiller0731 wrote:
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)

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Kudos [?]: 732 [0], given: 17

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Kudos [?]: 732 [0], given: 17

Re: DS: Equation of Line [#permalink]

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New post 02 Mar 2009, 12:09
is it a+b=1 or a+b=-1?
anyway its here
7-p509030
http://www.urch.com/forums/gmat-data-su ... stion.html
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Kudos [?]: 732 [0], given: 17

Re: DS: Equation of Line   [#permalink] 02 Mar 2009, 12:09
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In the xy-plane, at what two points does the graph of y =

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