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# GmatPrepTest2-Question2

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Manager
Joined: 24 Sep 2008
Posts: 189

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22 Feb 2009, 15:51
Quant again

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Senior Manager
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22 Feb 2009, 18:00
It is given, lines l and k passes thru the point (4,3). Let m1 and b1 be the slope and y intercept of line l and m2 and b2 be the sloe and y intercept of k. So we know =

3 = 4m1 + b1 ; 3 = 4m2 + b2. The question being asked is "Is product of the slopes negative ? ".

From stmt 2 : - product of y intercepts is negative ==> means ONLY one of b1 or b2 is we know that x intercept in general is is -b/m. So it is given that
(-b1/m1) (-b2/m2) > 0 ==> b1b2/m1m2 > 0. Here we can understand that product of slopes and product of y intercetps should be of the same sign. But we can't say whether the product is positive or negative. So insufficient.

Now combine both the clues -

From stmt1, product of y intercepts and product of slopes have the same sign.
From stmt2, product of y intercepts is negative.

Now we can conclude that product of slopes is negative. Because from stmt 1, we know that both the products are having the same sign.

IMO C.

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This is not a quality discussion. It has been retired.

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Re: GmatPrepTest2-Question2   [#permalink] 22 Feb 2009, 18:00
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# GmatPrepTest2-Question2

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